linter

35 files changed, 215 insertions, 215 deletions

diff --git a/src/android/index.ts b/src/android/index.ts
index e984ce4db..9c7efc0e1 100644
--- a/src/android/index.ts
+++ b/src/android/index.ts
@@ -44,7 +44,7 @@ export {
 } from "../crypto/workers/nodeThreadWorker";
 
 export class AndroidHttpLib implements HttpRequestLibrary {
-  useNfcTunnel: boolean = false;
+  useNfcTunnel = false;
 
   private nodeHttpLib: HttpRequestLibrary = new NodeHttpLib();
 
diff --git a/src/crypto/primitives/nacl-fast.ts b/src/crypto/primitives/nacl-fast.ts
index 23d8378b4..1defe1ad0 100644
--- a/src/crypto/primitives/nacl-fast.ts
+++ b/src/crypto/primitives/nacl-fast.ts
@@ -127,7 +127,7 @@ function ts64(x: Uint8Array, i: number, h: number, l: number) {
 }
 
 function vn(x: Uint8Array, xi: number, y: Uint8Array, yi: number, n: number) {
-  var i,
+  let i,
     d = 0;
   for (i = 0; i < n; i++) d |= x[xi + i] ^ y[yi + i];
   return (1 & ((d - 1) >>> 8)) - 1;
@@ -153,7 +153,7 @@ function crypto_verify_32(
 
 // prettier-ignore
 function core_salsa20(o: Uint8Array, p: Uint8Array, k: Uint8Array, c: Uint8Array) {
-  var j0  = c[ 0] & 0xff | (c[ 1] & 0xff)<<8 | (c[ 2] & 0xff)<<16 | (c[ 3] & 0xff)<<24,
+  const j0  = c[ 0] & 0xff | (c[ 1] & 0xff)<<8 | (c[ 2] & 0xff)<<16 | (c[ 3] & 0xff)<<24,
       j1  = k[ 0] & 0xff | (k[ 1] & 0xff)<<8 | (k[ 2] & 0xff)<<16 | (k[ 3] & 0xff)<<24,
       j2  = k[ 4] & 0xff | (k[ 5] & 0xff)<<8 | (k[ 6] & 0xff)<<16 | (k[ 7] & 0xff)<<24,
       j3  = k[ 8] & 0xff | (k[ 9] & 0xff)<<8 | (k[10] & 0xff)<<16 | (k[11] & 0xff)<<24,
@@ -170,11 +170,11 @@ function core_salsa20(o: Uint8Array, p: Uint8Array, k: Uint8Array, c: Uint8Array
       j14 = k[28] & 0xff | (k[29] & 0xff)<<8 | (k[30] & 0xff)<<16 | (k[31] & 0xff)<<24,
       j15 = c[12] & 0xff | (c[13] & 0xff)<<8 | (c[14] & 0xff)<<16 | (c[15] & 0xff)<<24;
 
-  var x0 = j0, x1 = j1, x2 = j2, x3 = j3, x4 = j4, x5 = j5, x6 = j6, x7 = j7,
+  let x0 = j0, x1 = j1, x2 = j2, x3 = j3, x4 = j4, x5 = j5, x6 = j6, x7 = j7,
       x8 = j8, x9 = j9, x10 = j10, x11 = j11, x12 = j12, x13 = j13, x14 = j14,
       x15 = j15, u;
 
-  for (var i = 0; i < 20; i += 2) {
+  for (let i = 0; i < 20; i += 2) {
     u = x0 + x12 | 0;
     x4 ^= u<<7 | u>>>(32-7);
     u = x4 + x0 | 0;
@@ -351,7 +351,7 @@ function core_hsalsa20(
   k: Uint8Array,
   c: Uint8Array,
 ) {
-  var j0 =
+  const j0 =
       (c[0] & 0xff) |
       ((c[1] & 0xff) << 8) |
       ((c[2] & 0xff) << 16) |
@@ -432,7 +432,7 @@ function core_hsalsa20(
       ((c[14] & 0xff) << 16) |
       ((c[15] & 0xff) << 24);
 
-  var x0 = j0,
+  let x0 = j0,
     x1 = j1,
     x2 = j2,
     x3 = j3,
@@ -450,7 +450,7 @@ function core_hsalsa20(
     x15 = j15,
     u;
 
-  for (var i = 0; i < 20; i += 2) {
+  for (let i = 0; i < 20; i += 2) {
     u = (x0 + x12) | 0;
     x4 ^= (u << 7) | (u >>> (32 - 7));
     u = (x4 + x0) | 0;
@@ -583,7 +583,7 @@ function crypto_core_hsalsa20(
   core_hsalsa20(out, inp, k, c);
 }
 
-var sigma = new Uint8Array([
+const sigma = new Uint8Array([
   101,
   120,
   112,
@@ -612,9 +612,9 @@ function crypto_stream_salsa20_xor(
   n: Uint8Array,
   k: Uint8Array,
 ) {
-  var z = new Uint8Array(16),
+  const z = new Uint8Array(16),
     x = new Uint8Array(64);
-  var u, i;
+  let u, i;
   for (i = 0; i < 16; i++) z[i] = 0;
   for (i = 0; i < 8; i++) z[i] = n[i];
   while (b >= 64) {
@@ -644,9 +644,9 @@ function crypto_stream_salsa20(
   n: Uint8Array,
   k: Uint8Array,
 ) {
-  var z = new Uint8Array(16),
+  const z = new Uint8Array(16),
     x = new Uint8Array(64);
-  var u, i;
+  let u, i;
   for (i = 0; i < 16; i++) z[i] = 0;
   for (i = 0; i < 8; i++) z[i] = n[i];
   while (b >= 64) {
@@ -675,10 +675,10 @@ function crypto_stream(
   n: Uint8Array,
   k: Uint8Array,
 ) {
-  var s = new Uint8Array(32);
+  const s = new Uint8Array(32);
   crypto_core_hsalsa20(s, n, k, sigma);
-  var sn = new Uint8Array(8);
-  for (var i = 0; i < 8; i++) sn[i] = n[i + 16];
+  const sn = new Uint8Array(8);
+  for (let i = 0; i < 8; i++) sn[i] = n[i + 16];
   return crypto_stream_salsa20(c, cpos, d, sn, s);
 }
 
@@ -691,10 +691,10 @@ function crypto_stream_xor(
   n: Uint8Array,
   k: Uint8Array,
 ) {
-  var s = new Uint8Array(32);
+  const s = new Uint8Array(32);
   crypto_core_hsalsa20(s, n, k, sigma);
-  var sn = new Uint8Array(8);
-  for (var i = 0; i < 8; i++) sn[i] = n[i + 16];
+  const sn = new Uint8Array(8);
+  for (let i = 0; i < 8; i++) sn[i] = n[i + 16];
   return crypto_stream_salsa20_xor(c, cpos, m, mpos, d, sn, s);
 }
 
@@ -712,7 +712,7 @@ class poly1305 {
   fin = 0;
 
   constructor(key: Uint8Array) {
-    var t0, t1, t2, t3, t4, t5, t6, t7;
+    let t0, t1, t2, t3, t4, t5, t6, t7;
 
     t0 = (key[0] & 0xff) | ((key[1] & 0xff) << 8);
     this.r[0] = t0 & 0x1fff;
@@ -744,11 +744,11 @@ class poly1305 {
   }
 
   blocks(m: Uint8Array, mpos: number, bytes: number) {
-    var hibit = this.fin ? 0 : 1 << 11;
-    var t0, t1, t2, t3, t4, t5, t6, t7, c;
-    var d0, d1, d2, d3, d4, d5, d6, d7, d8, d9;
+    const hibit = this.fin ? 0 : 1 << 11;
+    let t0, t1, t2, t3, t4, t5, t6, t7, c;
+    let d0, d1, d2, d3, d4, d5, d6, d7, d8, d9;
 
-    var h0 = this.h[0],
+    let h0 = this.h[0],
       h1 = this.h[1],
       h2 = this.h[2],
       h3 = this.h[3],
@@ -759,7 +759,7 @@ class poly1305 {
       h8 = this.h[8],
       h9 = this.h[9];
 
-    var r0 = this.r[0],
+    const r0 = this.r[0],
       r1 = this.r[1],
       r2 = this.r[2],
       r3 = this.r[3],
@@ -985,8 +985,8 @@ class poly1305 {
   }
 
   finish(mac: Uint8Array, macpos: number) {
-    var g = new Uint16Array(10);
-    var c, mask, f, i;
+    const g = new Uint16Array(10);
+    let c, mask, f, i;
 
     if (this.leftover) {
       i = this.leftover;
@@ -1062,7 +1062,7 @@ class poly1305 {
   }
 
   update(m: Uint8Array, mpos: number, bytes: number) {
-    var i, want;
+    let i, want;
 
     if (this.leftover) {
       want = 16 - this.leftover;
@@ -1098,7 +1098,7 @@ function crypto_onetimeauth(
   n: number,
   k: Uint8Array,
 ) {
-  var s = new poly1305(k);
+  const s = new poly1305(k);
   s.update(m, mpos, n);
   s.finish(out, outpos);
   return 0;
@@ -1112,7 +1112,7 @@ function crypto_onetimeauth_verify(
   n: number,
   k: Uint8Array,
 ) {
-  var x = new Uint8Array(16);
+  const x = new Uint8Array(16);
   crypto_onetimeauth(x, 0, m, mpos, n, k);
   return crypto_verify_16(h, hpos, x, 0);
 }
@@ -1124,7 +1124,7 @@ function crypto_secretbox(
   n: Uint8Array,
   k: Uint8Array,
 ) {
-  var i;
+  let i;
   if (d < 32) return -1;
   crypto_stream_xor(c, 0, m, 0, d, n, k);
   crypto_onetimeauth(c, 16, c, 32, d - 32, c);
@@ -1139,8 +1139,8 @@ function crypto_secretbox_open(
   n: Uint8Array,
   k: Uint8Array,
 ) {
-  var i;
-  var x = new Uint8Array(32);
+  let i;
+  const x = new Uint8Array(32);
   if (d < 32) return -1;
   crypto_stream(x, 0, 32, n, k);
   if (crypto_onetimeauth_verify(c, 16, c, 32, d - 32, x) !== 0) return -1;
@@ -1150,12 +1150,12 @@ function crypto_secretbox_open(
 }
 
 function set25519(r: Float64Array, a: Float64Array) {
-  var i;
+  let i;
   for (i = 0; i < 16; i++) r[i] = a[i] | 0;
 }
 
 function car25519(o: Float64Array) {
-  var i,
+  let i,
     v,
     c = 1;
   for (i = 0; i < 16; i++) {
@@ -1167,9 +1167,9 @@ function car25519(o: Float64Array) {
 }
 
 function sel25519(p: Float64Array, q: Float64Array, b: number) {
-  var t,
+  let t,
     c = ~(b - 1);
-  for (var i = 0; i < 16; i++) {
+  for (let i = 0; i < 16; i++) {
     t = c & (p[i] ^ q[i]);
     p[i] ^= t;
     q[i] ^= t;
@@ -1177,8 +1177,8 @@ function sel25519(p: Float64Array, q: Float64Array, b: number) {
 }
 
 function pack25519(o: Uint8Array, n: Float64Array) {
-  var i, j, b;
-  var m = gf(),
+  let i, j, b;
+  const m = gf(),
     t = gf();
   for (i = 0; i < 16; i++) t[i] = n[i];
   car25519(t);
@@ -1202,7 +1202,7 @@ function pack25519(o: Uint8Array, n: Float64Array) {
 }
 
 function neq25519(a: Float64Array, b: Float64Array) {
-  var c = new Uint8Array(32),
+  const c = new Uint8Array(32),
     d = new Uint8Array(32);
   pack25519(c, a);
   pack25519(d, b);
@@ -1210,27 +1210,27 @@ function neq25519(a: Float64Array, b: Float64Array) {
 }
 
 function par25519(a: Float64Array) {
-  var d = new Uint8Array(32);
+  const d = new Uint8Array(32);
   pack25519(d, a);
   return d[0] & 1;
 }
 
 function unpack25519(o: Float64Array, n: Uint8Array) {
-  var i;
+  let i;
   for (i = 0; i < 16; i++) o[i] = n[2 * i] + (n[2 * i + 1] << 8);
   o[15] &= 0x7fff;
 }
 
 function A(o: Float64Array, a: Float64Array, b: Float64Array) {
-  for (var i = 0; i < 16; i++) o[i] = a[i] + b[i];
+  for (let i = 0; i < 16; i++) o[i] = a[i] + b[i];
 }
 
 function Z(o: Float64Array, a: Float64Array, b: Float64Array) {
-  for (var i = 0; i < 16; i++) o[i] = a[i] - b[i];
+  for (let i = 0; i < 16; i++) o[i] = a[i] - b[i];
 }
 
 function M(o: Float64Array, a: Float64Array, b: Float64Array) {
-  var v,
+  let v,
     c,
     t0 = 0,
     t1 = 0,
@@ -1697,8 +1697,8 @@ function S(o: Float64Array, a: Float64Array) {
 }
 
 function inv25519(o: Float64Array, i: Float64Array) {
-  var c = gf();
-  var a;
+  const c = gf();
+  let a;
   for (a = 0; a < 16; a++) c[a] = i[a];
   for (a = 253; a >= 0; a--) {
     S(c, c);
@@ -1708,8 +1708,8 @@ function inv25519(o: Float64Array, i: Float64Array) {
 }
 
 function pow2523(o: Float64Array, i: Float64Array) {
-  var c = gf();
-  var a;
+  const c = gf();
+  let a;
   for (a = 0; a < 16; a++) c[a] = i[a];
   for (a = 250; a >= 0; a--) {
     S(c, c);
@@ -1719,11 +1719,11 @@ function pow2523(o: Float64Array, i: Float64Array) {
 }
 
 function crypto_scalarmult(q: Uint8Array, n: Uint8Array, p: Uint8Array) {
-  var z = new Uint8Array(32);
-  var x = new Float64Array(80),
+  const z = new Uint8Array(32);
+  let x = new Float64Array(80),
     r,
     i;
-  var a = gf(),
+  const a = gf(),
     b = gf(),
     c = gf(),
     d = gf(),
@@ -1769,8 +1769,8 @@ function crypto_scalarmult(q: Uint8Array, n: Uint8Array, p: Uint8Array) {
     x[i + 48] = b[i];
     x[i + 64] = d[i];
   }
-  var x32 = x.subarray(32);
-  var x16 = x.subarray(16);
+  const x32 = x.subarray(32);
+  const x16 = x.subarray(16);
   inv25519(x32, x32);
   M(x16, x16, x32);
   pack25519(q, x16);
@@ -1787,13 +1787,13 @@ function crypto_box_keypair(y: Uint8Array, x: Uint8Array) {
 }
 
 function crypto_box_beforenm(k: Uint8Array, y: Uint8Array, x: Uint8Array) {
-  var s = new Uint8Array(32);
+  const s = new Uint8Array(32);
   crypto_scalarmult(s, x, y);
   return crypto_core_hsalsa20(k, _0, s, sigma);
 }
 
-var crypto_box_afternm = crypto_secretbox;
-var crypto_box_open_afternm = crypto_secretbox_open;
+const crypto_box_afternm = crypto_secretbox;
+const crypto_box_open_afternm = crypto_secretbox_open;
 
 function crypto_box(
   c: Uint8Array,
@@ -1803,7 +1803,7 @@ function crypto_box(
   y: Uint8Array,
   x: Uint8Array,
 ) {
-  var k = new Uint8Array(32);
+  const k = new Uint8Array(32);
   crypto_box_beforenm(k, y, x);
   return crypto_box_afternm(c, m, d, n, k);
 }
@@ -1816,13 +1816,13 @@ function crypto_box_open(
   y: Uint8Array,
   x: Uint8Array,
 ) {
-  var k = new Uint8Array(32);
+  const k = new Uint8Array(32);
   crypto_box_beforenm(k, y, x);
   return crypto_box_open_afternm(m, c, d, n, k);
 }
 
 // prettier-ignore
-var K = [
+const K = [
   0x428a2f98, 0xd728ae22, 0x71374491, 0x23ef65cd,
   0xb5c0fbcf, 0xec4d3b2f, 0xe9b5dba5, 0x8189dbbc,
   0x3956c25b, 0xf348b538, 0x59f111f1, 0xb605d019,
@@ -1871,7 +1871,7 @@ function crypto_hashblocks_hl(
   m: Uint8Array,
   n: number,
 ) {
-  var wh = new Int32Array(16),
+  let wh = new Int32Array(16),
     wl = new Int32Array(16),
     bh0,
     bh1,
@@ -1900,7 +1900,7 @@ function crypto_hashblocks_hl(
     c,
     d;
 
-  var ah0 = hh[0],
+  let ah0 = hh[0],
     ah1 = hh[1],
     ah2 = hh[2],
     ah3 = hh[3],
@@ -1917,7 +1917,7 @@ function crypto_hashblocks_hl(
     al6 = hl[6],
     al7 = hl[7];
 
-  var pos = 0;
+  let pos = 0;
   while (n >= 128) {
     for (i = 0; i < 16; i++) {
       j = 8 * i + pos;
@@ -2342,7 +2342,7 @@ function crypto_hash(out: Uint8Array, m: Uint8Array, n: number) {
   const hh = new Int32Array(8);
   const hl = new Int32Array(8);
   const x = new Uint8Array(256);
-  let b = n;
+  const b = n;
 
   hh[0] = 0x6a09e667;
   hh[1] = 0xbb67ae85;
@@ -2436,7 +2436,7 @@ export class HashState {
     const out = new Uint8Array(64);
     let n = this.p;
     const x = new Uint8Array(256);
-    let b = this.total;
+    const b = this.total;
     for (let i = 0; i < n; i++) x[i] = this.next[i];
     x[n] = 128;
 
@@ -2451,7 +2451,7 @@ export class HashState {
 }
 
 function add(p: Float64Array[], q: Float64Array[]) {
-  var a = gf(),
+  const a = gf(),
     b = gf(),
     c = gf(),
     d = gf(),
@@ -2483,14 +2483,14 @@ function add(p: Float64Array[], q: Float64Array[]) {
 }
 
 function cswap(p: Float64Array[], q: Float64Array[], b: number) {
-  var i;
+  let i;
   for (i = 0; i < 4; i++) {
     sel25519(p[i], q[i], b);
   }
 }
 
 function pack(r: Uint8Array, p: Float64Array[]) {
-  var tx = gf(),
+  const tx = gf(),
     ty = gf(),
     zi = gf();
   inv25519(zi, p[2]);
@@ -2501,7 +2501,7 @@ function pack(r: Uint8Array, p: Float64Array[]) {
 }
 
 function scalarmult(p: Float64Array[], q: Float64Array[], s: Uint8Array) {
-  var b, i;
+  let b, i;
   set25519(p[0], gf0);
   set25519(p[1], gf1);
   set25519(p[2], gf1);
@@ -2545,7 +2545,7 @@ function crypto_sign_keypair(
   return 0;
 }
 
-var L = new Float64Array([
+const L = new Float64Array([
   0xed,
   0xd3,
   0xf5,
@@ -2581,7 +2581,7 @@ var L = new Float64Array([
 ]);
 
 function modL(r: Uint8Array, x: Float64Array) {
-  var carry, i, j, k;
+  let carry, i, j, k;
   for (i = 63; i >= 32; --i) {
     carry = 0;
     for (j = i - 32, k = i - 12; j < k; ++j) {
@@ -2614,20 +2614,20 @@ function reduce(r: Uint8Array) {
 
 // Note: difference from C - smlen returned, not passed as argument.
 function crypto_sign(sm: Uint8Array, m: Uint8Array, n: number, sk: Uint8Array) {
-  var d = new Uint8Array(64),
+  const d = new Uint8Array(64),
     h = new Uint8Array(64),
     r = new Uint8Array(64);
-  var i,
+  let i,
     j,
     x = new Float64Array(64);
-  var p = [gf(), gf(), gf(), gf()];
+  const p = [gf(), gf(), gf(), gf()];
 
   crypto_hash(d, sk, 32);
   d[0] &= 248;
   d[31] &= 127;
   d[31] |= 64;
 
-  var smlen = n + 64;
+  const smlen = n + 64;
   for (i = 0; i < n; i++) sm[64 + i] = m[i];
   for (i = 0; i < 32; i++) sm[32 + i] = d[32 + i];
 
@@ -2700,10 +2700,10 @@ function crypto_sign_open(
   n: number,
   pk: Uint8Array,
 ) {
-  var i, mlen;
-  var t = new Uint8Array(32),
+  let i, mlen;
+  const t = new Uint8Array(32),
     h = new Uint8Array(64);
-  var p = [gf(), gf(), gf(), gf()],
+  const p = [gf(), gf(), gf(), gf()],
     q = [gf(), gf(), gf(), gf()];
 
   mlen = -1;
@@ -2732,7 +2732,7 @@ function crypto_sign_open(
   return mlen;
 }
 
-var crypto_secretbox_KEYBYTES = 32,
+const crypto_secretbox_KEYBYTES = 32,
   crypto_secretbox_NONCEBYTES = 24,
   crypto_secretbox_ZEROBYTES = 32,
   crypto_secretbox_BOXZEROBYTES = 16,
@@ -2809,18 +2809,18 @@ function checkBoxLengths(pk: Uint8Array, sk: Uint8Array) {
 }
 
 function checkArrayTypes(...args: Uint8Array[]) {
-  for (var i = 0; i < args.length; i++) {
+  for (let i = 0; i < args.length; i++) {
     if (!(args[i] instanceof Uint8Array))
       throw new TypeError("unexpected type, use Uint8Array");
   }
 }
 
 function cleanup(arr: Uint8Array) {
-  for (var i = 0; i < arr.length; i++) arr[i] = 0;
+  for (let i = 0; i < arr.length; i++) arr[i] = 0;
 }
 
 export function randomBytes(n: number) {
-  var b = new Uint8Array(n);
+  const b = new Uint8Array(n);
   randombytes(b, n);
   return b;
 }
@@ -2828,9 +2828,9 @@ export function randomBytes(n: number) {
 export function secretbox(msg: Uint8Array, nonce: Uint8Array, key: Uint8Array) {
   checkArrayTypes(msg, nonce, key);
   checkLengths(key, nonce);
-  var m = new Uint8Array(crypto_secretbox_ZEROBYTES + msg.length);
-  var c = new Uint8Array(m.length);
-  for (var i = 0; i < msg.length; i++)
+  const m = new Uint8Array(crypto_secretbox_ZEROBYTES + msg.length);
+  const c = new Uint8Array(m.length);
+  for (let i = 0; i < msg.length; i++)
     m[i + crypto_secretbox_ZEROBYTES] = msg[i];
   crypto_secretbox(c, m, m.length, nonce, key);
   return c.subarray(crypto_secretbox_BOXZEROBYTES);
@@ -2843,9 +2843,9 @@ export function secretbox_open(
 ) {
   checkArrayTypes(box, nonce, key);
   checkLengths(key, nonce);
-  var c = new Uint8Array(crypto_secretbox_BOXZEROBYTES + box.length);
-  var m = new Uint8Array(c.length);
-  for (var i = 0; i < box.length; i++)
+  const c = new Uint8Array(crypto_secretbox_BOXZEROBYTES + box.length);
+  const m = new Uint8Array(c.length);
+  for (let i = 0; i < box.length; i++)
     c[i + crypto_secretbox_BOXZEROBYTES] = box[i];
   if (c.length < 32) return null;
   if (crypto_secretbox_open(m, c, c.length, nonce, key) !== 0) return null;
@@ -2860,7 +2860,7 @@ export function scalarMult(n: Uint8Array, p: Uint8Array) {
   checkArrayTypes(n, p);
   if (n.length !== crypto_scalarmult_SCALARBYTES) throw new Error("bad n size");
   if (p.length !== crypto_scalarmult_BYTES) throw new Error("bad p size");
-  var q = new Uint8Array(crypto_scalarmult_BYTES);
+  const q = new Uint8Array(crypto_scalarmult_BYTES);
   crypto_scalarmult(q, n, p);
   return q;
 }
@@ -2868,7 +2868,7 @@ export function scalarMult(n: Uint8Array, p: Uint8Array) {
 export function scalarMult_base(n: Uint8Array) {
   checkArrayTypes(n);
   if (n.length !== crypto_scalarmult_SCALARBYTES) throw new Error("bad n size");
-  var q = new Uint8Array(crypto_scalarmult_BYTES);
+  const q = new Uint8Array(crypto_scalarmult_BYTES);
   crypto_scalarmult_base(q, n);
   return q;
 }
@@ -2882,14 +2882,14 @@ export function box(
   publicKey: Uint8Array,
   secretKey: Uint8Array,
 ) {
-  var k = box_before(publicKey, secretKey);
+  const k = box_before(publicKey, secretKey);
   return secretbox(msg, nonce, k);
 }
 
 export function box_before(publicKey: Uint8Array, secretKey: Uint8Array) {
   checkArrayTypes(publicKey, secretKey);
   checkBoxLengths(publicKey, secretKey);
-  var k = new Uint8Array(crypto_box_BEFORENMBYTES);
+  const k = new Uint8Array(crypto_box_BEFORENMBYTES);
   crypto_box_beforenm(k, publicKey, secretKey);
   return k;
 }
@@ -2902,15 +2902,15 @@ export function box_open(
   publicKey: Uint8Array,
   secretKey: Uint8Array,
 ) {
-  var k = box_before(publicKey, secretKey);
+  const k = box_before(publicKey, secretKey);
   return secretbox_open(msg, nonce, k);
 }
 
 export const box_open_after = secretbox_open;
 
 export function box_keyPair() {
-  var pk = new Uint8Array(crypto_box_PUBLICKEYBYTES);
-  var sk = new Uint8Array(crypto_box_SECRETKEYBYTES);
+  const pk = new Uint8Array(crypto_box_PUBLICKEYBYTES);
+  const sk = new Uint8Array(crypto_box_SECRETKEYBYTES);
   crypto_box_keypair(pk, sk);
   return { publicKey: pk, secretKey: sk };
 }
@@ -2919,7 +2919,7 @@ export function box_keyPair_fromSecretKey(secretKey: Uint8Array) {
   checkArrayTypes(secretKey);
   if (secretKey.length !== crypto_box_SECRETKEYBYTES)
     throw new Error("bad secret key size");
-  var pk = new Uint8Array(crypto_box_PUBLICKEYBYTES);
+  const pk = new Uint8Array(crypto_box_PUBLICKEYBYTES);
   crypto_scalarmult_base(pk, secretKey);
   return { publicKey: pk, secretKey: new Uint8Array(secretKey) };
 }
@@ -2934,7 +2934,7 @@ export function sign(msg: Uint8Array, secretKey: Uint8Array) {
   checkArrayTypes(msg, secretKey);
   if (secretKey.length !== crypto_sign_SECRETKEYBYTES)
     throw new Error("bad secret key size");
-  var signedMsg = new Uint8Array(crypto_sign_BYTES + msg.length);
+  const signedMsg = new Uint8Array(crypto_sign_BYTES + msg.length);
   crypto_sign(signedMsg, msg, msg.length, secretKey);
   return signedMsg;
 }
@@ -2943,18 +2943,18 @@ export function sign_open(signedMsg: Uint8Array, publicKey: Uint8Array) {
   checkArrayTypes(signedMsg, publicKey);
   if (publicKey.length !== crypto_sign_PUBLICKEYBYTES)
     throw new Error("bad public key size");
-  var tmp = new Uint8Array(signedMsg.length);
-  var mlen = crypto_sign_open(tmp, signedMsg, signedMsg.length, publicKey);
+  const tmp = new Uint8Array(signedMsg.length);
+  const mlen = crypto_sign_open(tmp, signedMsg, signedMsg.length, publicKey);
   if (mlen < 0) return null;
-  var m = new Uint8Array(mlen);
-  for (var i = 0; i < m.length; i++) m[i] = tmp[i];
+  const m = new Uint8Array(mlen);
+  for (let i = 0; i < m.length; i++) m[i] = tmp[i];
   return m;
 }
 
 export function sign_detached(msg: Uint8Array, secretKey: Uint8Array) {
-  var signedMsg = sign(msg, secretKey);
-  var sig = new Uint8Array(crypto_sign_BYTES);
-  for (var i = 0; i < sig.length; i++) sig[i] = signedMsg[i];
+  const signedMsg = sign(msg, secretKey);
+  const sig = new Uint8Array(crypto_sign_BYTES);
+  for (let i = 0; i < sig.length; i++) sig[i] = signedMsg[i];
   return sig;
 }
 
@@ -2967,17 +2967,17 @@ export function sign_detached_verify(
   if (sig.length !== crypto_sign_BYTES) throw new Error("bad signature size");
   if (publicKey.length !== crypto_sign_PUBLICKEYBYTES)
     throw new Error("bad public key size");
-  var sm = new Uint8Array(crypto_sign_BYTES + msg.length);
-  var m = new Uint8Array(crypto_sign_BYTES + msg.length);
-  var i;
+  const sm = new Uint8Array(crypto_sign_BYTES + msg.length);
+  const m = new Uint8Array(crypto_sign_BYTES + msg.length);
+  let i;
   for (i = 0; i < crypto_sign_BYTES; i++) sm[i] = sig[i];
   for (i = 0; i < msg.length; i++) sm[i + crypto_sign_BYTES] = msg[i];
   return crypto_sign_open(m, sm, sm.length, publicKey) >= 0;
 }
 
 export function sign_keyPair() {
-  var pk = new Uint8Array(crypto_sign_PUBLICKEYBYTES);
-  var sk = new Uint8Array(crypto_sign_SECRETKEYBYTES);
+  const pk = new Uint8Array(crypto_sign_PUBLICKEYBYTES);
+  const sk = new Uint8Array(crypto_sign_SECRETKEYBYTES);
   crypto_sign_keypair(pk, sk, false);
   return { publicKey: pk, secretKey: sk };
 }
@@ -3009,17 +3009,17 @@ export function sign_keyPair_fromSecretKey(secretKey: Uint8Array) {
   checkArrayTypes(secretKey);
   if (secretKey.length !== crypto_sign_SECRETKEYBYTES)
     throw new Error("bad secret key size");
-  var pk = new Uint8Array(crypto_sign_PUBLICKEYBYTES);
-  for (var i = 0; i < pk.length; i++) pk[i] = secretKey[32 + i];
+  const pk = new Uint8Array(crypto_sign_PUBLICKEYBYTES);
+  for (let i = 0; i < pk.length; i++) pk[i] = secretKey[32 + i];
   return { publicKey: pk, secretKey: new Uint8Array(secretKey) };
 }
 
 export function sign_keyPair_fromSeed(seed: Uint8Array) {
   checkArrayTypes(seed);
   if (seed.length !== crypto_sign_SEEDBYTES) throw new Error("bad seed size");
-  var pk = new Uint8Array(crypto_sign_PUBLICKEYBYTES);
-  var sk = new Uint8Array(crypto_sign_SECRETKEYBYTES);
-  for (var i = 0; i < 32; i++) sk[i] = seed[i];
+  const pk = new Uint8Array(crypto_sign_PUBLICKEYBYTES);
+  const sk = new Uint8Array(crypto_sign_SECRETKEYBYTES);
+  for (let i = 0; i < 32; i++) sk[i] = seed[i];
   crypto_sign_keypair(pk, sk, true);
   return { publicKey: pk, secretKey: sk };
 }
@@ -3031,7 +3031,7 @@ export const sign_signatureLength = crypto_sign_BYTES;
 
 export function hash(msg: Uint8Array) {
   checkArrayTypes(msg);
-  var h = new Uint8Array(crypto_hash_BYTES);
+  const h = new Uint8Array(crypto_hash_BYTES);
   crypto_hash(h, msg, msg.length);
   return h;
 }
@@ -3082,9 +3082,9 @@ export function sign_ed25519_pk_to_curve25519(
     typeof self !== "undefined" ? self.crypto || (self as any).msCrypto : null;
   if (cr && cr.getRandomValues) {
     // Browsers.
-    var QUOTA = 65536;
+    const QUOTA = 65536;
     setPRNG(function (x: Uint8Array, n: number) {
-      var i,
+      let i,
         v = new Uint8Array(n);
       for (i = 0; i < n; i += QUOTA) {
         cr.getRandomValues(v.subarray(i, i + Math.min(n - i, QUOTA)));
@@ -3097,7 +3097,7 @@ export function sign_ed25519_pk_to_curve25519(
     const cr = require("crypto");
     if (cr && cr.randomBytes) {
       setPRNG(function (x: Uint8Array, n: number) {
-        var i,
+        let i,
           v = cr.randomBytes(n);
         for (i = 0; i < n; i++) x[i] = v[i];
         cleanup(v);
diff --git a/src/crypto/primitives/sha256.ts b/src/crypto/primitives/sha256.ts
index c0f245bb3..ed88b5ffd 100644
--- a/src/crypto/primitives/sha256.ts
+++ b/src/crypto/primitives/sha256.ts
@@ -11,8 +11,8 @@
 //  Classes:
 //
 //   new sha256.Hash()
-export const digestLength: number = 32;
-export const blockSize: number = 64;
+export const digestLength = 32;
+export const blockSize = 64;
 
 // SHA-256 constants
 const K = new Uint32Array([
@@ -188,10 +188,10 @@ export class HashSha256 {
   private state: Int32Array = new Int32Array(8); // hash state
   private temp: Int32Array = new Int32Array(64); // temporary state
   private buffer: Uint8Array = new Uint8Array(128); // buffer for data to hash
-  private bufferLength: number = 0; // number of bytes in buffer
-  private bytesHashed: number = 0; // number of total bytes hashed
+  private bufferLength = 0; // number of bytes in buffer
+  private bytesHashed = 0; // number of total bytes hashed
 
-  finished: boolean = false; // indicates whether the hash was finalized
+  finished = false; // indicates whether the hash was finalized
 
   constructor() {
     this.reset();
diff --git a/src/crypto/talerCrypto-test.ts b/src/crypto/talerCrypto-test.ts
index 11068f7d4..1efa766f3 100644
--- a/src/crypto/talerCrypto-test.ts
+++ b/src/crypto/talerCrypto-test.ts
@@ -40,7 +40,7 @@ function hexToBytes(hex: string) {
 
 function bytesToHex(bytes: Uint8Array): string {
   for (var hex = [], i = 0; i < bytes.length; i++) {
-    var current = bytes[i] < 0 ? bytes[i] + 256 : bytes[i];
+    const current = bytes[i] < 0 ? bytes[i] + 256 : bytes[i];
     hex.push((current >>> 4).toString(16));
     hex.push((current & 0xf).toString(16));
   }
diff --git a/src/crypto/workers/cryptoApi.ts b/src/crypto/workers/cryptoApi.ts
index 46dc7dfaf..24a43ff47 100644
--- a/src/crypto/workers/cryptoApi.ts
+++ b/src/crypto/workers/cryptoApi.ts
@@ -133,7 +133,7 @@ export class BrowserCryptoWorkerFactory implements CryptoWorkerFactory {
  * for the execution of expensive operations.
  */
 export class CryptoApi {
-  private nextRpcId: number = 1;
+  private nextRpcId = 1;
   private workers: WorkerState[];
   private workQueues: WorkItem[][];
 
@@ -142,12 +142,12 @@ export class CryptoApi {
   /**
    * Number of busy workers.
    */
-  private numBusy: number = 0;
+  private numBusy = 0;
 
   /**
    * Did we stop accepting new requests?
    */
-  private stopped: boolean = false;
+  private stopped = false;
 
   static enableTracing = false;
 
@@ -155,7 +155,7 @@ export class CryptoApi {
    * Terminate all worker threads.
    */
   terminateWorkers() {
-    for (let worker of this.workers) {
+    for (const worker of this.workers) {
       if (worker.w) {
         CryptoApi.enableTracing && console.log("terminating worker");
         worker.w.terminate();
diff --git a/src/crypto/workers/cryptoImplementation.ts b/src/crypto/workers/cryptoImplementation.ts
index eef8f5955..0a3c217ab 100644
--- a/src/crypto/workers/cryptoImplementation.ts
+++ b/src/crypto/workers/cryptoImplementation.ts
@@ -123,13 +123,13 @@ class SignaturePurposeBuilder {
 
   build(): Uint8Array {
     let payloadLen = 0;
-    for (let c of this.chunks) {
+    for (const c of this.chunks) {
       payloadLen += c.byteLength;
     }
     const buf = new ArrayBuffer(4 + 4 + payloadLen);
     const u8buf = new Uint8Array(buf);
     let p = 8;
-    for (let c of this.chunks) {
+    for (const c of this.chunks) {
       u8buf.set(c, p);
       p += c.byteLength;
     }
@@ -158,7 +158,7 @@ function checkSignKeyOkay(
 }
 
 export class CryptoImplementation {
-  static enableTracing: boolean = false;
+  static enableTracing = false;
 
   constructor() {}
 
diff --git a/src/headless/clk.ts b/src/headless/clk.ts
index 7c99384bb..09f758ad4 100644
--- a/src/headless/clk.ts
+++ b/src/headless/clk.ts
@@ -23,8 +23,8 @@ import readline from "readline";
 
 class Converter<T> {}
 
-export let INT = new Converter<number>();
-export let STRING: Converter<string> = new Converter<string>();
+export const INT = new Converter<number>();
+export const STRING: Converter<string> = new Converter<string>();
 
 export interface OptionArgs<T> {
   help?: string;
@@ -90,7 +90,7 @@ function splitOpt(opt: string): { key: string; value?: string } {
 }
 
 function formatListing(key: string, value?: string): string {
-  let res = "  " + key;
+  const res = "  " + key;
   if (!value) {
     return res;
   }
@@ -139,7 +139,7 @@ export class CommandGroup<GN extends keyof any, TG> {
       name: name as string,
     };
     this.options.push(def);
-    for (let flag of flagspec) {
+    for (const flag of flagspec) {
       if (flag.startsWith("--")) {
         const flagname = flag.substring(2);
         this.longOptions[flagname] = def;
@@ -168,7 +168,7 @@ export class CommandGroup<GN extends keyof any, TG> {
       name: name as string,
     };
     this.options.push(def);
-    for (let flag of flagspec) {
+    for (const flag of flagspec) {
       if (flag.startsWith("--")) {
         const flagname = flag.substring(2);
         this.longOptions[flagname] = def;
@@ -225,7 +225,7 @@ export class CommandGroup<GN extends keyof any, TG> {
       name: name as string,
     };
     this.options.push(def);
-    for (let flag of flagspec) {
+    for (const flag of flagspec) {
       if (flag.startsWith("--")) {
         const flagname = flag.substring(2);
         this.longOptions[flagname] = def;
@@ -271,7 +271,7 @@ export class CommandGroup<GN extends keyof any, TG> {
 
   printHelp(progName: string, parents: CommandGroup<any, any>[]) {
     let usageSpec = "";
-    for (let p of parents) {
+    for (const p of parents) {
       usageSpec += (p.name ?? progName) + " ";
       if (p.arguments.length >= 1) {
         usageSpec += "<ARGS...> ";
@@ -281,7 +281,7 @@ export class CommandGroup<GN extends keyof any, TG> {
     if (this.subcommands.length != 0) {
       usageSpec += "COMMAND ";
     }
-    for (let a of this.arguments) {
+    for (const a of this.arguments) {
       const argName = a.args.metavar ?? a.name;
       usageSpec += `<${argName}> `;
     }
@@ -294,7 +294,7 @@ export class CommandGroup<GN extends keyof any, TG> {
     if (this.options.length != 0) {
       console.log();
       console.log("Options:");
-      for (let opt of this.options) {
+      for (const opt of this.options) {
         let optSpec = opt.flagspec.join(", ");
         if (!opt.isFlag) {
           optSpec = optSpec + "=VALUE";
@@ -306,7 +306,7 @@ export class CommandGroup<GN extends keyof any, TG> {
     if (this.subcommands.length != 0) {
       console.log();
       console.log("Commands:");
-      for (let subcmd of this.subcommands) {
+      for (const subcmd of this.subcommands) {
         console.log(formatListing(subcmd.name, subcmd.args.help));
       }
     }
@@ -444,7 +444,7 @@ export class CommandGroup<GN extends keyof any, TG> {
       }
     }
 
-    for (let option of this.options) {
+    for (const option of this.options) {
       if (option.isFlag == false && option.required == true) {
         if (!foundOptions[option.name]) {
           if (option.args.default !== undefined) {
@@ -459,7 +459,7 @@ export class CommandGroup<GN extends keyof any, TG> {
       }
     }
 
-    for (let option of this.options) {
+    for (const option of this.options) {
       const ph = option.args.onPresentHandler;
       if (ph && foundOptions[option.name]) {
         ph(myArgs[option.name]);
diff --git a/src/headless/helpers.ts b/src/headless/helpers.ts
index 053332b37..11e2c90de 100644
--- a/src/headless/helpers.ts
+++ b/src/headless/helpers.ts
@@ -138,9 +138,9 @@ export async function getDefaultNodeWallet(
 
 export async function withdrawTestBalance(
   myWallet: Wallet,
-  amount: string = "TESTKUDOS:10",
-  bankBaseUrl: string = "https://bank.test.taler.net/",
-  exchangeBaseUrl: string = "https://exchange.test.taler.net/",
+  amount = "TESTKUDOS:10",
+  bankBaseUrl = "https://bank.test.taler.net/",
+  exchangeBaseUrl = "https://exchange.test.taler.net/",
 ) {
   const reserveResponse = await myWallet.createReserve({
     amount: amounts.parseOrThrow(amount),
diff --git a/src/headless/integrationtest.ts b/src/headless/integrationtest.ts
index 6e45b76e2..9934f2048 100644
--- a/src/headless/integrationtest.ts
+++ b/src/headless/integrationtest.ts
@@ -43,7 +43,7 @@ async function makePayment(
   amount: string,
   summary: string,
 ): Promise<{ orderId: string }> {
-  let orderResp = await merchant.createOrder(
+  const orderResp = await merchant.createOrder(
     amount,
     summary,
     "taler://fulfillment-success/thx",
@@ -60,7 +60,7 @@ async function makePayment(
     throw Error("no taler://pay/ URI in payment response");
   }
 
-  let preparePayResult = await wallet.preparePayForUri(talerPayUri);
+  const preparePayResult = await wallet.preparePayForUri(talerPayUri);
 
   console.log("prepare pay result", preparePayResult);
 
@@ -68,7 +68,7 @@ async function makePayment(
     throw Error("payment not possible");
   }
 
-  let confirmPayResult = await wallet.confirmPay(
+  const confirmPayResult = await wallet.confirmPay(
     preparePayResult.proposalId,
     undefined,
   );
@@ -159,7 +159,7 @@ export async function runIntegrationTest(args: IntegrationTestArgs) {
   // Wait until the withdraw is done
   await myWallet.runUntilDone();
 
-  let { orderId: refundOrderId } = await makePayment(
+  const { orderId: refundOrderId } = await makePayment(
     myWallet,
     myMerchant,
     Amounts.stringify(spendAmountTwo),
@@ -299,7 +299,7 @@ export async function runIntegrationTestBasic(cfg: Configuration) {
   // Wait until the withdraw is done
   await myWallet.runUntilDone();
 
-  let { orderId: refundOrderId } = await makePayment(
+  const { orderId: refundOrderId } = await makePayment(
     myWallet,
     myMerchant,
     Amounts.stringify(spendAmountTwo),
diff --git a/src/headless/taler-wallet-cli.ts b/src/headless/taler-wallet-cli.ts
index c7909948f..a7dcce9a3 100644
--- a/src/headless/taler-wallet-cli.ts
+++ b/src/headless/taler-wallet-cli.ts
@@ -593,7 +593,7 @@ testCli
   })
   .action(async (args) => {
     applyVerbose(args.wallet.verbose);
-    let cmdObj = args.integrationtestCmd;
+    const cmdObj = args.integrationtestCmd;
 
     try {
       await runIntegrationTest({
diff --git a/src/i18n/strings-prelude b/src/i18n/strings-prelude
index 147b6c939..aa6602bd4 100644
--- a/src/i18n/strings-prelude
+++ b/src/i18n/strings-prelude
@@ -14,4 +14,4 @@
  TALER; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
  */
 
-export let strings: {[s: string]: any} = {};
+export const strings: {[s: string]: any} = {};
diff --git a/src/i18n/strings.ts b/src/i18n/strings.ts
index 289dcbedc..06fb7a896 100644
--- a/src/i18n/strings.ts
+++ b/src/i18n/strings.ts
@@ -14,7 +14,7 @@
  TALER; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
  */
 
-export let strings: { [s: string]: any } = {};
+export const strings: { [s: string]: any } = {};
 strings["de"] = {
   domain: "messages",
   locale_data: {
diff --git a/src/operations/exchanges.ts b/src/operations/exchanges.ts
index b9806bb62..53b250a8e 100644
--- a/src/operations/exchanges.ts
+++ b/src/operations/exchanges.ts
@@ -198,7 +198,7 @@ async function updateExchangeWithKeys(
     ),
   );
 
-  let recoupGroupId: string | undefined = undefined;
+  const recoupGroupId: string | undefined = undefined;
 
   await ws.db.runWithWriteTransaction(
     [Stores.exchanges, Stores.denominations, Stores.recoupGroups, Stores.coins],
@@ -459,7 +459,7 @@ async function updateExchangeWithWireInfo(
 export async function updateExchangeFromUrl(
   ws: InternalWalletState,
   baseUrl: string,
-  forceNow: boolean = false,
+  forceNow = false,
 ): Promise<ExchangeRecord> {
   const onOpErr = (e: OperationError) => setExchangeError(ws, baseUrl, e);
   return await guardOperationException(
@@ -476,7 +476,7 @@ export async function updateExchangeFromUrl(
 async function updateExchangeFromUrlImpl(
   ws: InternalWalletState,
   baseUrl: string,
-  forceNow: boolean = false,
+  forceNow = false,
 ): Promise<ExchangeRecord> {
   const now = getTimestampNow();
   baseUrl = canonicalizeBaseUrl(baseUrl);
@@ -583,7 +583,7 @@ export async function getExchangePaytoUri(
   if (!exchangeWireInfo) {
     throw Error(`Exchange wire info for '${exchangeBaseUrl}' not found.`);
   }
-  for (let account of exchangeWireInfo.accounts) {
+  for (const account of exchangeWireInfo.accounts) {
     const res = parsePaytoUri(account.payto_uri);
     if (!res) {
       continue;
diff --git a/src/operations/history.ts b/src/operations/history.ts
index edb4d9f27..b043e4a90 100644
--- a/src/operations/history.ts
+++ b/src/operations/history.ts
@@ -333,7 +333,7 @@ export async function getHistory(
             amountsRaw.push(c.currentAmount);
           }
         }
-        let amountRefreshedRaw = Amounts.sum(amountsRaw).amount;
+        const amountRefreshedRaw = Amounts.sum(amountsRaw).amount;
         let amountRefreshedEffective: AmountJson;
         if (amountsEffective.length == 0) {
           amountRefreshedEffective = Amounts.getZero(
diff --git a/src/operations/pay.ts b/src/operations/pay.ts
index 9b9d2fa9f..3a629e9c2 100644
--- a/src/operations/pay.ts
+++ b/src/operations/pay.ts
@@ -198,8 +198,8 @@ export function selectPayCoins(
   let totalFees = Amounts.getZero(currency);
   let amountPayRemaining = paymentAmount;
   let amountDepositFeeLimitRemaining = depositFeeLimit;
-  let customerWireFees = Amounts.getZero(currency);
-  let customerDepositFees = Amounts.getZero(currency);
+  const customerWireFees = Amounts.getZero(currency);
+  const customerDepositFees = Amounts.getZero(currency);
   for (const aci of acis) {
     // Don't use this coin if depositing it is more expensive than
     // the amount it would give the merchant.
@@ -283,7 +283,7 @@ async function getCoinsForPayment(
   const exchanges = await ws.db.iter(Stores.exchanges).toArray();
 
   for (const exchange of exchanges) {
-    let isOkay: boolean = false;
+    let isOkay = false;
     const exchangeDetails = exchange.details;
     if (!exchangeDetails) {
       continue;
@@ -618,7 +618,7 @@ async function incrementPurchasePayRetry(
 export async function processDownloadProposal(
   ws: InternalWalletState,
   proposalId: string,
-  forceNow: boolean = false,
+  forceNow = false,
 ): Promise<void> {
   const onOpErr = (err: OperationError) =>
     incrementProposalRetry(ws, proposalId, err);
@@ -1106,7 +1106,7 @@ export async function confirmPay(
 export async function processPurchasePay(
   ws: InternalWalletState,
   proposalId: string,
-  forceNow: boolean = false,
+  forceNow = false,
 ): Promise<void> {
   const onOpErr = (e: OperationError) =>
     incrementPurchasePayRetry(ws, proposalId, e);
diff --git a/src/operations/pending.ts b/src/operations/pending.ts
index 106e5053c..cee929aa2 100644
--- a/src/operations/pending.ts
+++ b/src/operations/pending.ts
@@ -54,7 +54,7 @@ async function gatherExchangePending(
   tx: TransactionHandle,
   now: Timestamp,
   resp: PendingOperationsResponse,
-  onlyDue: boolean = false,
+  onlyDue = false,
 ): Promise<void> {
   if (onlyDue) {
     // FIXME: exchanges should also be updated regularly
@@ -146,7 +146,7 @@ async function gatherReservePending(
   tx: TransactionHandle,
   now: Timestamp,
   resp: PendingOperationsResponse,
-  onlyDue: boolean = false,
+  onlyDue = false,
 ): Promise<void> {
   // FIXME: this should be optimized by using an index for "onlyDue==true".
   await tx.iter(Stores.reserves).forEach((reserve) => {
@@ -215,7 +215,7 @@ async function gatherRefreshPending(
   tx: TransactionHandle,
   now: Timestamp,
   resp: PendingOperationsResponse,
-  onlyDue: boolean = false,
+  onlyDue = false,
 ): Promise<void> {
   await tx.iter(Stores.refreshGroups).forEach((r) => {
     if (r.timestampFinished) {
@@ -244,7 +244,7 @@ async function gatherWithdrawalPending(
   tx: TransactionHandle,
   now: Timestamp,
   resp: PendingOperationsResponse,
-  onlyDue: boolean = false,
+  onlyDue = false,
 ): Promise<void> {
   await tx.iter(Stores.withdrawalGroups).forEach((wsr) => {
     if (wsr.timestampFinish) {
@@ -279,7 +279,7 @@ async function gatherProposalPending(
   tx: TransactionHandle,
   now: Timestamp,
   resp: PendingOperationsResponse,
-  onlyDue: boolean = false,
+  onlyDue = false,
 ): Promise<void> {
   await tx.iter(Stores.proposals).forEach((proposal) => {
     if (proposal.proposalStatus == ProposalStatus.PROPOSED) {
@@ -320,7 +320,7 @@ async function gatherTipPending(
   tx: TransactionHandle,
   now: Timestamp,
   resp: PendingOperationsResponse,
-  onlyDue: boolean = false,
+  onlyDue = false,
 ): Promise<void> {
   await tx.iter(Stores.tips).forEach((tip) => {
     if (tip.pickedUp) {
@@ -350,7 +350,7 @@ async function gatherPurchasePending(
   tx: TransactionHandle,
   now: Timestamp,
   resp: PendingOperationsResponse,
-  onlyDue: boolean = false,
+  onlyDue = false,
 ): Promise<void> {
   await tx.iter(Stores.purchases).forEach((pr) => {
     if (pr.paymentSubmitPending) {
@@ -413,7 +413,7 @@ async function gatherRecoupPending(
   tx: TransactionHandle,
   now: Timestamp,
   resp: PendingOperationsResponse,
-  onlyDue: boolean = false,
+  onlyDue = false,
 ): Promise<void> {
   await tx.iter(Stores.recoupGroups).forEach((rg) => {
     if (rg.timestampFinished) {
diff --git a/src/operations/recoup.ts b/src/operations/recoup.ts
index e13ae3c1f..97bc39564 100644
--- a/src/operations/recoup.ts
+++ b/src/operations/recoup.ts
@@ -291,7 +291,7 @@ async function resetRecoupGroupRetry(
 export async function processRecoupGroup(
   ws: InternalWalletState,
   recoupGroupId: string,
-  forceNow: boolean = false,
+  forceNow = false,
 ): Promise<void> {
   await ws.memoProcessRecoup.memo(recoupGroupId, async () => {
     const onOpErr = (e: OperationError) =>
@@ -306,7 +306,7 @@ export async function processRecoupGroup(
 async function processRecoupGroupImpl(
   ws: InternalWalletState,
   recoupGroupId: string,
-  forceNow: boolean = false,
+  forceNow = false,
 ): Promise<void> {
   if (forceNow) {
     await resetRecoupGroupRetry(ws, recoupGroupId);
@@ -386,7 +386,7 @@ async function processRecoup(
 
   const coinPub = recoupGroup.coinPubs[coinIdx];
 
-  let coin = await ws.db.get(Stores.coins, coinPub);
+  const coin = await ws.db.get(Stores.coins, coinPub);
   if (!coin) {
     throw Error(`Coin ${coinPub} not found, can't request payback`);
   }
diff --git a/src/operations/refresh.ts b/src/operations/refresh.ts
index be4f5c5af..23d192e0a 100644
--- a/src/operations/refresh.ts
+++ b/src/operations/refresh.ts
@@ -446,7 +446,7 @@ async function refreshReveal(
         rg.timestampFinished = getTimestampNow();
         rg.retryInfo = initRetryInfo(false);
       }
-      for (let coin of coins) {
+      for (const coin of coins) {
         await tx.put(Stores.coins, coin);
       }
       await tx.put(Stores.refreshGroups, rg);
@@ -482,7 +482,7 @@ async function incrementRefreshRetry(
 export async function processRefreshGroup(
   ws: InternalWalletState,
   refreshGroupId: string,
-  forceNow: boolean = false,
+  forceNow = false,
 ): Promise<void> {
   await ws.memoProcessRefresh.memo(refreshGroupId, async () => {
     const onOpErr = (e: OperationError) =>
diff --git a/src/operations/refund.ts b/src/operations/refund.ts
index f0fec4065..74d4b848e 100644
--- a/src/operations/refund.ts
+++ b/src/operations/refund.ts
@@ -300,7 +300,7 @@ export async function applyRefund(
 export async function processPurchaseQueryRefund(
   ws: InternalWalletState,
   proposalId: string,
-  forceNow: boolean = false,
+  forceNow = false,
 ): Promise<void> {
   const onOpErr = (e: OperationError) =>
     incrementPurchaseQueryRefundRetry(ws, proposalId, e);
@@ -366,7 +366,7 @@ async function processPurchaseQueryRefundImpl(
 export async function processPurchaseApplyRefund(
   ws: InternalWalletState,
   proposalId: string,
-  forceNow: boolean = false,
+  forceNow = false,
 ): Promise<void> {
   const onOpErr = (e: OperationError) =>
     incrementPurchaseApplyRefundRetry(ws, proposalId, e);
@@ -460,7 +460,7 @@ async function processPurchaseApplyRefundImpl(
       }
 
       // Groups that failed/succeeded
-      let groups: { [refundGroupId: string]: boolean } = {};
+      const groups: { [refundGroupId: string]: boolean } = {};
 
       // Avoid duplicates
       const refreshCoinsMap: { [coinPub: string]: CoinPublicKey } = {};
diff --git a/src/operations/reserves.ts b/src/operations/reserves.ts
index 5c299d112..2ee1b358f 100644
--- a/src/operations/reserves.ts
+++ b/src/operations/reserves.ts
@@ -248,7 +248,7 @@ export async function forceQueryReserve(
 export async function processReserve(
   ws: InternalWalletState,
   reservePub: string,
-  forceNow: boolean = false,
+  forceNow = false,
 ): Promise<void> {
   return ws.memoProcessReserve.memo(reservePub, async () => {
     const onOpError = (err: OperationError) =>
@@ -264,7 +264,7 @@ async function registerReserveWithBank(
   ws: InternalWalletState,
   reservePub: string,
 ): Promise<void> {
-  let reserve = await ws.db.get(Stores.reserves, reservePub);
+  const reserve = await ws.db.get(Stores.reserves, reservePub);
   switch (reserve?.reserveStatus) {
     case ReserveRecordStatus.WAIT_CONFIRM_BANK:
     case ReserveRecordStatus.REGISTERING_BANK:
@@ -317,7 +317,7 @@ async function processReserveBankStatusImpl(
   ws: InternalWalletState,
   reservePub: string,
 ): Promise<void> {
-  let reserve = await ws.db.get(Stores.reserves, reservePub);
+  const reserve = await ws.db.get(Stores.reserves, reservePub);
   switch (reserve?.reserveStatus) {
     case ReserveRecordStatus.WAIT_CONFIRM_BANK:
     case ReserveRecordStatus.REGISTERING_BANK:
@@ -534,7 +534,7 @@ async function updateReserve(
 async function processReserveImpl(
   ws: InternalWalletState,
   reservePub: string,
-  forceNow: boolean = false,
+  forceNow = false,
 ): Promise<void> {
   const reserve = await ws.db.get(Stores.reserves, reservePub);
   if (!reserve) {
diff --git a/src/operations/tip.ts b/src/operations/tip.ts
index 7bfbddb6a..1a88dbca3 100644
--- a/src/operations/tip.ts
+++ b/src/operations/tip.ts
@@ -66,7 +66,7 @@ export async function getTipStatus(
 
   console.log("status", tipPickupStatus);
 
-  let amount = Amounts.parseOrThrow(tipPickupStatus.amount);
+  const amount = Amounts.parseOrThrow(tipPickupStatus.amount);
 
   let tipRecord = await ws.db.get(Stores.tips, [
     res.merchantTipId,
@@ -147,7 +147,7 @@ async function incrementTipRetry(
 export async function processTip(
   ws: InternalWalletState,
   tipId: string,
-  forceNow: boolean = false,
+  forceNow = false,
 ): Promise<void> {
   const onOpErr = (e: OperationError) => incrementTipRetry(ws, tipId, e);
   await guardOperationException(
diff --git a/src/operations/withdraw.ts b/src/operations/withdraw.ts
index fcd9d70c9..70ecf9aed 100644
--- a/src/operations/withdraw.ts
+++ b/src/operations/withdraw.ts
@@ -394,7 +394,7 @@ async function incrementWithdrawalRetry(
 export async function processWithdrawGroup(
   ws: InternalWalletState,
   withdrawalGroupId: string,
-  forceNow: boolean = false,
+  forceNow = false,
 ): Promise<void> {
   const onOpErr = (e: OperationError) =>
     incrementWithdrawalRetry(ws, withdrawalGroupId, e);
@@ -470,7 +470,7 @@ export async function getExchangeWithdrawalInfo(
     .reduce((a, b) => Amounts.add(a, b).amount);
 
   const exchangeWireAccounts: string[] = [];
-  for (let account of exchangeWireInfo.accounts) {
+  for (const account of exchangeWireInfo.accounts) {
     exchangeWireAccounts.push(account.payto_uri);
   }
 
diff --git a/src/types/dbTypes.ts b/src/types/dbTypes.ts
index f94fb6c6f..434993cb5 100644
--- a/src/types/dbTypes.ts
+++ b/src/types/dbTypes.ts
@@ -117,7 +117,7 @@ export function updateRetryInfoTimeout(
 }
 
 export function initRetryInfo(
-  active: boolean = true,
+  active = true,
   p: RetryPolicy = defaultRetryPolicy,
 ): RetryInfo {
   if (!active) {
diff --git a/src/util/amounts.ts b/src/util/amounts.ts
index f9946393f..f0a4f1d72 100644
--- a/src/util/amounts.ts
+++ b/src/util/amounts.ts
@@ -260,7 +260,7 @@ export function parse(s: string): AmountJson | undefined {
   if (tail.length > fractionalLength + 1) {
     return undefined;
   }
-  let value = Number.parseInt(res[2]);
+  const value = Number.parseInt(res[2]);
   if (value > maxAmountValue) {
     return undefined;
   }
diff --git a/src/util/query.ts b/src/util/query.ts
index ce704b4fc..44f668658 100644
--- a/src/util/query.ts
+++ b/src/util/query.ts
@@ -123,8 +123,8 @@ interface CursorValueResult<T> {
 
 class ResultStream<T> {
   private currentPromise: Promise<void>;
-  private gotCursorEnd: boolean = false;
-  private awaitingResult: boolean = false;
+  private gotCursorEnd = false;
+  private awaitingResult = false;
 
   constructor(private req: IDBRequest) {
     this.awaitingResult = true;
@@ -304,7 +304,7 @@ function runWithTransaction<T>(
     const storeName = stores.map((x) => x.name);
     const tx = db.transaction(storeName, mode);
     let funResult: any = undefined;
-    let gotFunResult: boolean = false;
+    let gotFunResult = false;
     tx.oncomplete = () => {
       // This is a fatal error: The transaction completed *before*
       // the transaction function returned.  Likely, the transaction
diff --git a/src/util/time.ts b/src/util/time.ts
index 138ecb876..05188b6d2 100644
--- a/src/util/time.ts
+++ b/src/util/time.ts
@@ -34,7 +34,7 @@ export interface Duration {
   readonly d_ms: number | "forever";
 }
 
-let timeshift: number = 0;
+let timeshift = 0;
 
 export function setDangerousTimetravel(dt: number) {
   timeshift = dt;
diff --git a/src/util/timer.ts b/src/util/timer.ts
index 8706c939e..a1712b03f 100644
--- a/src/util/timer.ts
+++ b/src/util/timer.ts
@@ -87,7 +87,7 @@ const nullTimerHandle = {
  * Group of timers that can be destroyed at once.
  */
 export class TimerGroup {
-  private stopped: boolean = false;
+  private stopped = false;
 
   private timerMap: { [index: number]: TimerHandle } = {};
 
diff --git a/src/wallet.ts b/src/wallet.ts
index 3171d0cea..063a259d6 100644
--- a/src/wallet.ts
+++ b/src/wallet.ts
@@ -140,7 +140,7 @@ export class Wallet {
   private ws: InternalWalletState;
   private timerGroup: TimerGroup = new TimerGroup();
   private latch = new AsyncCondition();
-  private stopped: boolean = false;
+  private stopped = false;
   private memoRunRetryLoop = new AsyncOpMemoSingle<void>();
 
   get db(): Database {
@@ -175,7 +175,7 @@ export class Wallet {
    */
   async processOnePendingOperation(
     pending: PendingOperationInfo,
-    forceNow: boolean = false,
+    forceNow = false,
   ): Promise<void> {
     console.log("running pending", pending);
     switch (pending.type) {
@@ -230,7 +230,7 @@ export class Wallet {
   /**
    * Process pending operations.
    */
-  public async runPending(forceNow: boolean = false): Promise<void> {
+  public async runPending(forceNow = false): Promise<void> {
     const onlyDue = !forceNow;
     const pendingOpsResponse = await this.getPendingOperations({ onlyDue });
     for (const p of pendingOpsResponse.pendingOperations) {
@@ -318,7 +318,7 @@ export class Wallet {
   private async runRetryLoopImpl(): Promise<void> {
     while (!this.stopped) {
       console.log("running wallet retry loop iteration");
-      let pending = await this.getPendingOperations({ onlyDue: true });
+      const pending = await this.getPendingOperations({ onlyDue: true });
       console.log("pending ops", JSON.stringify(pending, undefined, 2));
       if (pending.pendingOperations.length === 0) {
         const allPending = await this.getPendingOperations({ onlyDue: false });
@@ -382,7 +382,7 @@ export class Wallet {
           }
         });
         if (!applied) {
-          for (let c of builtinCurrencies) {
+          for (const c of builtinCurrencies) {
             await tx.put(Stores.currencies, c);
           }
         }
@@ -489,7 +489,7 @@ export class Wallet {
    */
   async updateExchangeFromUrl(
     baseUrl: string,
-    force: boolean = false,
+    force = false,
   ): Promise<ExchangeRecord> {
     try {
       return updateExchangeFromUrl(this.ws, baseUrl, force);
diff --git a/src/webex/chromeBadge.ts b/src/webex/chromeBadge.ts
index cdd99f8c1..330388ca0 100644
--- a/src/webex/chromeBadge.ts
+++ b/src/webex/chromeBadge.ts
@@ -38,25 +38,25 @@ export class ChromeBadge {
    * might still be running even if we're not busy anymore,
    * just to transition to the "normal" state in a animated way.
    */
-  private animationRunning: boolean = false;
+  private animationRunning = false;
 
   /**
    * Is the wallet still busy? Note that we do not stop the
    * animation immediately when the wallet goes idle, but
    * instead slowly close the gap.
    */
-  private isBusy: boolean = false;
+  private isBusy = false;
 
   /**
    * Current rotation angle, ranges from 0 to rotationAngleMax.
    */
-  private rotationAngle: number = 0;
+  private rotationAngle = 0;
 
   /**
    * While animating, how wide is the current gap in the circle?
    * Ranges from 0 to openMax.
    */
-  private gapWidth: number = 0;
+  private gapWidth = 0;
 
   /**
    * Should we show the notification dot?
diff --git a/src/webex/i18n.tsx b/src/webex/i18n.tsx
index a156cf834..ed6fe868f 100644
--- a/src/webex/i18n.tsx
+++ b/src/webex/i18n.tsx
@@ -30,7 +30,7 @@ import * as React from "react";
 
 const jed = setupJed();
 
-let enableTracing = false;
+const enableTracing = false;
 
 /**
  * Set up jed library for internationalization,
diff --git a/src/webex/notify.ts b/src/webex/notify.ts
index d76d121a0..887658ef9 100644
--- a/src/webex/notify.ts
+++ b/src/webex/notify.ts
@@ -26,9 +26,9 @@
  */
 import * as wxApi from "./wxApi";
 
-declare var cloneInto: any;
+declare let cloneInto: any;
 
-let logVerbose: boolean = false;
+let logVerbose = false;
 try {
   logVerbose = !!localStorage.getItem("taler-log-verbose");
 } catch (e) {
diff --git a/src/webex/pages/benchmark.tsx b/src/webex/pages/benchmark.tsx
index 1efe7898d..bf4c4b04d 100644
--- a/src/webex/pages/benchmark.tsx
+++ b/src/webex/pages/benchmark.tsx
@@ -77,7 +77,7 @@ class BenchmarkRunner extends React.Component<any, BenchmarkRunnerState> {
 
   async run() {
     this.setState({ result: undefined, running: true });
-    let result = await wxApi.benchmarkCrypto(this.state.repetitions);
+    const result = await wxApi.benchmarkCrypto(this.state.repetitions);
     this.setState({ result, running: false });
   }
 
diff --git a/src/webex/pages/popup.tsx b/src/webex/pages/popup.tsx
index f4a2bf568..6cd7242ff 100644
--- a/src/webex/pages/popup.tsx
+++ b/src/webex/pages/popup.tsx
@@ -427,8 +427,8 @@ function amountDiff(
   total: string | Amounts.AmountJson,
   partial: string | Amounts.AmountJson,
 ): Amounts.AmountJson | string {
-  let a = typeof total === "string" ? Amounts.parse(total) : total;
-  let b = typeof partial === "string" ? Amounts.parse(partial) : partial;
+  const a = typeof total === "string" ? Amounts.parse(total) : total;
+  const b = typeof partial === "string" ? Amounts.parse(partial) : partial;
   if (a && b) {
     return Amounts.sub(a, b).amount;
   } else {
@@ -437,7 +437,7 @@ function amountDiff(
 }
 
 function parseSummary(summary: string) {
-  let parsed = summary.split(/: (.+)/);
+  const parsed = summary.split(/: (.+)/);
   return {
     merchant: parsed[0],
     item: parsed[1],
diff --git a/src/webex/renderHtml.tsx b/src/webex/renderHtml.tsx
index 082dd84dd..b6ff1248c 100644
--- a/src/webex/renderHtml.tsx
+++ b/src/webex/renderHtml.tsx
@@ -61,7 +61,7 @@ export const AmountView = ({ amount }: { amount: AmountJson | string }) =>
  * Abbreviate a string to a given length, and show the full
  * string on hover as a tooltip.
  */
-export function abbrev(s: string, n: number = 5) {
+export function abbrev(s: string, n = 5) {
   let sAbbrev = s;
   if (s.length > n) {
     sAbbrev = s.slice(0, n) + "..";
diff --git a/src/webex/wxBackend.ts b/src/webex/wxBackend.ts
index 4c9a76556..ef4715dce 100644
--- a/src/webex/wxBackend.ts
+++ b/src/webex/wxBackend.ts
@@ -384,7 +384,7 @@ let currentDatabase: IDBDatabase | undefined;
  */
 let outdatedDbVersion: number | undefined;
 
-let walletInit: OpenedPromise<void> = openPromise<void>();
+const walletInit: OpenedPromise<void> = openPromise<void>();
 
 async function reinitWallet() {
   if (currentWallet) {
@@ -571,7 +571,7 @@ export async function wxMain() {
       }
       if (details.statusCode === 402 || details.statusCode === 202) {
         console.log(`got 402/202 from ${details.url}`);
-        for (let header of details.responseHeaders || []) {
+        for (const header of details.responseHeaders || []) {
           if (header.name.toLowerCase() === "taler") {
             const talerUri = header.value || "";
             const uriType = classifyTalerUri(talerUri);