chore: remove unused promisify code (#21114)

This commit is contained in:
Shelley Vohr 2019-11-14 05:50:50 +00:00 committed by Cheng Zhao
parent 457b7bf24f
commit af1e8a347e
5 changed files with 1 additions and 156 deletions

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@ -1,17 +1,6 @@
## Promisification
The Electron team is currently undergoing an initiative to convert callback-based functions in Electron to return Promises. During this transition period, both the callback and Promise-based versions of these functions will work correctly, and will both be documented.
To enable deprecation warnings for these updated functions, use the [`process.enablePromiseAPIs` runtime flag](../process.md#processenablepromiseapis).
When a majority of affected functions are migrated, this flag will be enabled by default and all developers will be able to see these deprecation warnings. At that time, the callback-based versions will also be removed from documentation. This document will be continuously updated as more functions are converted.
### Candidate Functions
- [app.importCertificate(options, callback)](https://github.com/electron/electron/blob/master/docs/api/app.md#importCertificate)
- [contents.print([options], [callback])](https://github.com/electron/electron/blob/master/docs/api/web-contents.md#print)
### Converted Functions
The Electron team recently underwent an initiative to convert callback-based APIs to Promise-based ones. See converted functions below:
- [app.getFileIcon(path[, options], callback)](https://github.com/electron/electron/blob/master/docs/api/app.md#getFileIcon)
- [contents.capturePage([rect, ]callback)](https://github.com/electron/electron/blob/master/docs/api/web-contents.md#capturePage)

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@ -82,12 +82,6 @@ A `Boolean` that controls whether or not deprecation warnings are printed to `st
Setting this to `true` will silence deprecation warnings. This property is used
instead of the `--no-deprecation` command line flag.
### `process.enablePromiseAPIs`
A `Boolean` that controls whether or not deprecation warnings are printed to `stderr` when
formerly callback-based APIs converted to Promises are invoked using callbacks. Setting this to `true`
will enable deprecation warnings.
### `process.resourcesPath` _Readonly_
A `String` representing the path to the resources directory.

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@ -116,64 +116,6 @@ const deprecate: ElectronInternal.DeprecationUtil = {
})
},
// deprecate a callback-based function in favor of one returning a Promise
promisify: <T extends (...args: any[]) => any>(fn: T): T => {
const fnName = fn.name || 'function'
const oldName = `${fnName} with callbacks`
const newName = `${fnName} with Promises`
const warn = warnOnce(oldName, newName)
return function (this: any, ...params: any[]) {
let cb: Function | undefined
if (params.length > 0 && typeof params[params.length - 1] === 'function') {
cb = params.pop()
}
const promise = fn.apply(this, params)
if (!cb) return promise
if (process.enablePromiseAPIs) warn()
return promise
.then((res: any) => {
process.nextTick(() => {
cb!.length === 2 ? cb!(null, res) : cb!(res)
})
return res
}, (err: Error) => {
process.nextTick(() => {
cb!.length === 2 ? cb!(err) : cb!()
})
throw err
})
} as T
},
// convertPromiseValue: Temporarily disabled until it's used
// deprecate a callback-based function in favor of one returning a Promise
promisifyMultiArg: <T extends (...args: any[]) => any>(fn: T /* convertPromiseValue: (v: any) => any */): T => {
const fnName = fn.name || 'function'
const oldName = `${fnName} with callbacks`
const newName = `${fnName} with Promises`
const warn = warnOnce(oldName, newName)
return function (this: any, ...params) {
let cb: Function | undefined
if (params.length > 0 && typeof params[params.length - 1] === 'function') {
cb = params.pop()
}
const promise = fn.apply(this, params)
if (!cb) return promise
if (process.enablePromiseAPIs) warn()
return promise
.then((res: any) => {
process.nextTick(() => {
// eslint-disable-next-line standard/no-callback-literal
cb!.length > 2 ? cb!(null, ...res) : cb!(...res)
})
}, (err: Error) => {
process.nextTick(() => cb!(err))
})
} as T
},
// change the name of a property
renameProperty: (o, oldName, newName) => {
const warn = warnOnce(oldName, newName)

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@ -192,79 +192,4 @@ describe('deprecate', () => {
expect(warnings[0]).to.equal('\'old\' is deprecated and will be removed. Please use \'new\' instead.')
})
})
describe('promisify', () => {
const expected = 'Hello, world!'
let promiseFunc: (param: any) => Promise<any>
let warnings: string[]
const enableCallbackWarnings = () => {
warnings = []
deprecate.setHandler(warning => warnings.push(warning))
process.enablePromiseAPIs = true
}
beforeEach(() => {
deprecate.setHandler(null)
process.throwDeprecation = true
promiseFunc = param => new Promise((resolve) => resolve(param))
})
it('acts as a pass-through for promise-based invocations', async () => {
enableCallbackWarnings()
promiseFunc = deprecate.promisify(promiseFunc)
const actual = await promiseFunc(expected)
expect(actual).to.equal(expected)
expect(warnings).to.have.lengthOf(0)
})
it('only calls back an error if the callback is called with (err, data)', async () => {
enableCallbackWarnings()
const erringPromiseFunc = deprecate.promisify(
() => new Promise((resolve, reject) => {
reject(new Error('fail'))
})
)
{
const [err, data] = await new Promise(resolve => {
(erringPromiseFunc as any)((err: Error | undefined, data: any) => {
resolve([err, data])
}).catch(() => { /* silence deprecation warning */ })
})
expect(data).to.be.undefined()
expect(err).to.be.an.instanceOf(Error).with.property('message', 'fail')
}
{
const data = await new Promise(resolve => {
(erringPromiseFunc as any)((data: any) => { resolve(data) })
.catch(() => { /* silence deprecation warning */ })
})
expect(data).to.be.undefined()
}
})
it('warns exactly once for callback-based invocations', (done) => {
enableCallbackWarnings()
promiseFunc = deprecate.promisify(promiseFunc)
let callbackCount = 0
const invocationCount = 3
const callback = (actual: number) => {
expect(actual).to.equal(expected)
expect(warnings).to.have.lengthOf(1)
expect(warnings[0]).to.include('promiseFunc')
callbackCount += 1
if (callbackCount === invocationCount) {
done()
}
}
for (let i = 0; i < invocationCount; i += 1) {
(promiseFunc as any)(expected, callback)
}
})
})
})

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@ -90,11 +90,6 @@ declare namespace ElectronInternal {
removeProperty<T, K extends (keyof T & string)>(object: T, propertyName: K): T;
renameProperty<T, K extends (keyof T & string)>(object: T, oldName: string, newName: K): T;
moveAPI(fn: Function, oldUsage: string, newUsage: string): Function;
promisify<T extends (...args: any[]) => any>(fn: T): T;
// convertPromiseValue: Temporarily disabled until it's used
promisifyMultiArg<T extends (...args: any[]) => any>(fn: T, /*convertPromiseValue: (v: any) => any*/): T;
}
interface DesktopCapturer {