@10xjs/polyfill-analyzer 中文文档教程
@10xjs/polyfill-analyzer
分析 javascript 文件以确定运行它需要哪些 polyfill。 专为与
polyfill-library
一起使用而设计。
Usage
Polyfill 分析器静态分析一串 javascript 并返回一个与 polyfill-library
。
import fs from 'fs';
import {analyze} from '@10xjs/polyfill-analyzer';
const features = analyze({
source: s.readFileSync('./bundle.js', 'utf-8'),
// `include` is a list of feature names to detect. Without a value provided,
// `analyze` will default to detecting all possible features (using
// `polyfillLibrary.listAllPolyfills()`). If you know your browser support
// target, `include` should be provided as the list of only the polyfills
// possibly needed for the targeted browsers.
include: [
'Symbol',
'Symbol.toStringTag',
'Symbol.iterator',
'Array.from',
'Object.entries',
'Array.prototype.findIndex',
'Object.keys',
'Object.getOwnPropertyDescriptor',
'Object.getOwnPropertyDescriptors',
],
// Configure the behavior when an an entry in the `include` array is not a
// detectable polyfill. (Not all features listed by
// polyfillLibrary.listAllPolyfills()` can be detected.)
// Allowed values are "ignore", "warn", and "error";
unsupportedPolyfill: 'ignore',
});
// Returns an array of feature names which can be used to generate a custom
// polyfill bundle using `polyfillLibrary.getPolyfillString()`.
// [
// 'Symbol',
// 'Symbol.toStringTag',
// 'Array.from',
// 'Object.keys',
// 'Object.getOwnPropertyDescriptor',
// 'Object.getOwnPropertyDescriptors',
// ]
API
analyze(options)
获取运行 javascript 字符串所需的 polyfill 列表。
@param {string} [options.source]
Javascript source code.@param {string[]} [options.include]
List of polyfills (from polyfill-library) to detect. Defaults to all detectable polyfills.@param {string[]} [options.exclude=[]]
List of polyfills to ignore. The exclude list has precedence over the include list.@param {"ignore"|"warn"|"error"} [options.unsupportedPolyfill="error"]
Specify the behavior when an included unsupported polyfill is encountered in theoptions.include
list.
@10xjs/polyfill-analyzer
Analyze a javascript file to determine which polyfills are necessary to run it. Designed for use with
polyfill-library
.
Usage
Polyfill analyzer statically analyzes a string of javascript and returns an array of polyfill feature names compatible with with polyfill-library
.
import fs from 'fs';
import {analyze} from '@10xjs/polyfill-analyzer';
const features = analyze({
source: s.readFileSync('./bundle.js', 'utf-8'),
// `include` is a list of feature names to detect. Without a value provided,
// `analyze` will default to detecting all possible features (using
// `polyfillLibrary.listAllPolyfills()`). If you know your browser support
// target, `include` should be provided as the list of only the polyfills
// possibly needed for the targeted browsers.
include: [
'Symbol',
'Symbol.toStringTag',
'Symbol.iterator',
'Array.from',
'Object.entries',
'Array.prototype.findIndex',
'Object.keys',
'Object.getOwnPropertyDescriptor',
'Object.getOwnPropertyDescriptors',
],
// Configure the behavior when an an entry in the `include` array is not a
// detectable polyfill. (Not all features listed by
// polyfillLibrary.listAllPolyfills()` can be detected.)
// Allowed values are "ignore", "warn", and "error";
unsupportedPolyfill: 'ignore',
});
// Returns an array of feature names which can be used to generate a custom
// polyfill bundle using `polyfillLibrary.getPolyfillString()`.
// [
// 'Symbol',
// 'Symbol.toStringTag',
// 'Array.from',
// 'Object.keys',
// 'Object.getOwnPropertyDescriptor',
// 'Object.getOwnPropertyDescriptors',
// ]
API
analyze(options)
Get a list of polyfills necessary for running a string of javascript.
@param {string} [options.source]
Javascript source code.@param {string[]} [options.include]
List of polyfills (from polyfill-library) to detect. Defaults to all detectable polyfills.@param {string[]} [options.exclude=[]]
List of polyfills to ignore. The exclude list has precedence over the include list.@param {"ignore"|"warn"|"error"} [options.unsupportedPolyfill="error"]
Specify the behavior when an included unsupported polyfill is encountered in theoptions.include
list.
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