diff options
Diffstat (limited to 'node_modules/once/once.js')
-rw-r--r-- | node_modules/once/once.js | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/node_modules/once/once.js b/node_modules/once/once.js new file mode 100644 index 000000000..235406736 --- /dev/null +++ b/node_modules/once/once.js @@ -0,0 +1,42 @@ +var wrappy = require('wrappy') +module.exports = wrappy(once) +module.exports.strict = wrappy(onceStrict) + +once.proto = once(function () { + Object.defineProperty(Function.prototype, 'once', { + value: function () { + return once(this) + }, + configurable: true + }) + + Object.defineProperty(Function.prototype, 'onceStrict', { + value: function () { + return onceStrict(this) + }, + configurable: true + }) +}) + +function once (fn) { + var f = function () { + if (f.called) return f.value + f.called = true + return f.value = fn.apply(this, arguments) + } + f.called = false + return f +} + +function onceStrict (fn) { + var f = function () { + if (f.called) + throw new Error(f.onceError) + f.called = true + return f.value = fn.apply(this, arguments) + } + var name = fn.name || 'Function wrapped with `once`' + f.onceError = name + " shouldn't be called more than once" + f.called = false + return f +} |