95 lines
2.5 KiB
JavaScript
95 lines
2.5 KiB
JavaScript
'use strict'
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let deprecationHandler = null
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function warnOnce (oldName, newName) {
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let warned = false
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const msg = newName
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? `'${oldName}' is deprecated and will be removed. Please use '${newName}' instead.`
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: `'${oldName}' is deprecated and will be removed.`
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return () => {
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if (!warned && !process.noDeprecation) {
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warned = true
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deprecate.log(msg)
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}
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}
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}
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const deprecate = {
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setHandler: (handler) => { deprecationHandler = handler },
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getHandler: () => deprecationHandler,
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warn: (oldName, newName) => {
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return deprecate.log(`'${oldName}' is deprecated. Use '${newName}' instead.`)
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},
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log: (message) => {
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if (typeof deprecationHandler === 'function') {
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deprecationHandler(message)
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} else if (process.throwDeprecation) {
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throw new Error(message)
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} else if (process.traceDeprecation) {
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return console.trace(message)
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} else {
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return console.warn(`(electron) ${message}`)
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}
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},
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event: (emitter, oldName, newName) => {
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const warn = newName.startsWith('-') /* internal event */
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? warnOnce(`${oldName} event`)
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: warnOnce(`${oldName} event`, `${newName} event`)
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return emitter.on(newName, function (...args) {
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if (this.listenerCount(oldName) !== 0) {
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warn()
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this.emit(oldName, ...args)
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}
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})
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},
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removeProperty: (o, removedName) => {
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// if the property's already been removed, warn about it
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if (!(removedName in o)) {
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deprecate.log(`Unable to remove property '${removedName}' from an object that lacks it.`)
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}
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// wrap the deprecated property in an accessor to warn
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const warn = warnOnce(removedName)
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let val = o[removedName]
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return Object.defineProperty(o, removedName, {
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configurable: true,
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get: () => {
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warn()
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return val
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},
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set: newVal => {
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warn()
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val = newVal
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}
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})
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},
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renameProperty: (o, oldName, newName) => {
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const warn = warnOnce(oldName, newName)
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// if the new property isn't there yet,
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// inject it and warn about it
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if ((oldName in o) && !(newName in o)) {
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warn()
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o[newName] = o[oldName]
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}
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// wrap the deprecated property in an accessor to warn
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// and redirect to the new property
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return Object.defineProperty(o, oldName, {
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get: () => {
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warn()
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return o[newName]
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},
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set: value => {
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warn()
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o[newName] = value
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}
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})
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}
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}
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module.exports = deprecate
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