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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const browserslistTargetHandler = require("./browserslistTargetHandler");
/**
* @param {string} context the context directory
* @returns {string} default target
*/
const getDefaultTarget = context => {
const browsers = browserslistTargetHandler.load(null, context);
return browsers ? "browserslist" : "web";
};
/**
* @typedef {Object} PlatformTargetProperties
* @property {boolean | null} web web platform, importing of http(s) and std: is available
* @property {boolean | null} browser browser platform, running in a normal web browser
* @property {boolean | null} webworker (Web)Worker platform, running in a web/shared/service worker
* @property {boolean | null} node node platform, require of node built-in modules is available
* @property {boolean | null} nwjs nwjs platform, require of legacy nw.gui is available
* @property {boolean | null} electron electron platform, require of some electron built-in modules is available
*/
/**
* @typedef {Object} ElectronContextTargetProperties
* @property {boolean | null} electronMain in main context
* @property {boolean | null} electronPreload in preload context
* @property {boolean | null} electronRenderer in renderer context with node integration
*/
/**
* @typedef {Object} ApiTargetProperties
* @property {boolean | null} require has require function available
* @property {boolean | null} nodeBuiltins has node.js built-in modules available
* @property {boolean | null} document has document available (allows script tags)
* @property {boolean | null} importScripts has importScripts available
* @property {boolean | null} importScriptsInWorker has importScripts available when creating a worker
* @property {boolean | null} fetchWasm has fetch function available for WebAssembly
* @property {boolean | null} global has global variable available
*/
/**
* @typedef {Object} EcmaTargetProperties
* @property {boolean | null} globalThis has globalThis variable available
* @property {boolean | null} bigIntLiteral big int literal syntax is available
* @property {boolean | null} const const and let variable declarations are available
* @property {boolean | null} arrowFunction arrow functions are available
* @property {boolean | null} forOf for of iteration is available
* @property {boolean | null} destructuring destructuring is available
* @property {boolean | null} dynamicImport async import() is available
* @property {boolean | null} dynamicImportInWorker async import() is available when creating a worker
* @property {boolean | null} module ESM syntax is available (when in module)
*/
///** @typedef {PlatformTargetProperties | ApiTargetProperties | EcmaTargetProperties | PlatformTargetProperties & ApiTargetProperties | PlatformTargetProperties & EcmaTargetProperties | ApiTargetProperties & EcmaTargetProperties} TargetProperties */
/** @template T @typedef {{ [P in keyof T]?: never }} Never<T> */
/** @template A @template B @typedef {(A & Never<B>) | (Never<A> & B) | (A & B)} Mix<A,B> */
/** @typedef {Mix<Mix<PlatformTargetProperties, ElectronContextTargetProperties>, Mix<ApiTargetProperties, EcmaTargetProperties>>} TargetProperties */
const versionDependent = (major, minor) => {
if (!major) return () => /** @type {undefined} */ (undefined);
major = +major;
minor = minor ? +minor : 0;
return (vMajor, vMinor = 0) => {
return major > vMajor || (major === vMajor && minor >= vMinor);
};
};
/** @type {[string, string, RegExp, (...args: string[]) => TargetProperties | false][]} */
const TARGETS = [
[
"browserslist / browserslist:env / browserslist:query / browserslist:path-to-config / browserslist:path-to-config:env",
"Resolve features from browserslist. Will resolve browserslist config automatically. Only browser or node queries are supported (electron is not supported). Examples: 'browserslist:modern' to use 'modern' environment from browserslist config",
/^browserslist(?::(.+))?$/,
(rest, context) => {
const browsers = browserslistTargetHandler.load(
rest ? rest.trim() : null,
context
);
if (!browsers) {
throw new Error(`No browserslist config found to handle the 'browserslist' target.
See https://github.com/browserslist/browserslist#queries for possible ways to provide a config.
The recommended way is to add a 'browserslist' key to your package.json and list supported browsers (resp. node.js versions).
You can also more options via the 'target' option: 'browserslist' / 'browserslist:env' / 'browserslist:query' / 'browserslist:path-to-config' / 'browserslist:path-to-config:env'`);
}
return browserslistTargetHandler.resolve(browsers);
}
],
[
"web",
"Web browser.",
/^web$/,
() => {
return {
web: true,
browser: true,
webworker: null,
node: false,
electron: false,
nwjs: false,
document: true,
importScriptsInWorker: true,
fetchWasm: true,
nodeBuiltins: false,
importScripts: false,
require: false,
global: false
};
}
],
[
"webworker",
"Web Worker, SharedWorker or Service Worker.",
/^webworker$/,
() => {
return {
web: true,
browser: true,
webworker: true,
node: false,
electron: false,
nwjs: false,
importScripts: true,
importScriptsInWorker: true,
fetchWasm: true,
nodeBuiltins: false,
require: false,
document: false,
global: false
};
}
],
[
"[async-]node[X[.Y]]",
"Node.js in version X.Y. The 'async-' prefix will load chunks asynchronously via 'fs' and 'vm' instead of 'require()'. Examples: node14.5, async-node10.",
/^(async-)?node(\d+(?:\.(\d+))?)?$/,
(asyncFlag, major, minor) => {
const v = versionDependent(major, minor);
// see https://node.green/
return {
node: true,
electron: false,
nwjs: false,
web: false,
webworker: false,
browser: false,
require: !asyncFlag,
nodeBuiltins: true,
global: true,
document: false,
fetchWasm: false,
importScripts: false,
importScriptsInWorker: false,
globalThis: v(12),
const: v(6),
arrowFunction: v(6),
forOf: v(5),
destructuring: v(6),
bigIntLiteral: v(10, 4),
dynamicImport: v(12, 17),
dynamicImportInWorker: major ? false : undefined,
module: v(12, 17)
};
}
],
[
"electron[X[.Y]]-main/preload/renderer",
"Electron in version X.Y. Script is running in main, preload resp. renderer context.",
/^electron(\d+(?:\.(\d+))?)?-(main|preload|renderer)$/,
(major, minor, context) => {
const v = versionDependent(major, minor);
// see https://node.green/ + https://github.com/electron/releases
return {
node: true,
electron: true,
web: context !== "main",
webworker: false,
browser: false,
nwjs: false,
electronMain: context === "main",
electronPreload: context === "preload",
electronRenderer: context === "renderer",
global: true,
nodeBuiltins: true,
require: true,
document: context === "renderer",
fetchWasm: context === "renderer",
importScripts: false,
importScriptsInWorker: false,
globalThis: v(5),
const: v(1, 1),
arrowFunction: v(1, 1),
forOf: v(0, 36),
destructuring: v(1, 1),
bigIntLiteral: v(4),
dynamicImport: v(11),
dynamicImportInWorker: major ? false : undefined,
module: v(11)
};
}
],
[
"nwjs[X[.Y]] / node-webkit[X[.Y]]",
"NW.js in version X.Y.",
/^(?:nwjs|node-webkit)(\d+(?:\.(\d+))?)?$/,
(major, minor) => {
const v = versionDependent(major, minor);
// see https://node.green/ + https://github.com/nwjs/nw.js/blob/nw48/CHANGELOG.md
return {
node: true,
web: true,
nwjs: true,
webworker: null,
browser: false,
electron: false,
global: true,
nodeBuiltins: true,
document: false,
importScriptsInWorker: false,
fetchWasm: false,
importScripts: false,
require: false,
globalThis: v(0, 43),
const: v(0, 15),
arrowFunction: v(0, 15),
forOf: v(0, 13),
destructuring: v(0, 15),
bigIntLiteral: v(0, 32),
dynamicImport: v(0, 43),
dynamicImportInWorker: major ? false : undefined,
module: v(0, 43)
};
}
],
[
"esX",
"EcmaScript in this version. Examples: es2020, es5.",
/^es(\d+)$/,
version => {
let v = +version;
if (v < 1000) v = v + 2009;
return {
const: v >= 2015,
arrowFunction: v >= 2015,
forOf: v >= 2015,
destructuring: v >= 2015,
module: v >= 2015,
globalThis: v >= 2020,
bigIntLiteral: v >= 2020,
dynamicImport: v >= 2020,
dynamicImportInWorker: v >= 2020
};
}
]
];
/**
* @param {string} target the target
* @param {string} context the context directory
* @returns {TargetProperties} target properties
*/
const getTargetProperties = (target, context) => {
for (const [, , regExp, handler] of TARGETS) {
const match = regExp.exec(target);
if (match) {
const [, ...args] = match;
const result = handler(...args, context);
if (result) return result;
}
}
throw new Error(
`Unknown target '${target}'. The following targets are supported:\n${TARGETS.map(
([name, description]) => `* ${name}: ${description}`
).join("\n")}`
);
};
const mergeTargetProperties = targetProperties => {
const keys = new Set();
for (const tp of targetProperties) {
for (const key of Object.keys(tp)) {
keys.add(key);
}
}
const result = {};
for (const key of keys) {
let hasTrue = false;
let hasFalse = false;
for (const tp of targetProperties) {
const value = tp[key];
switch (value) {
case true:
hasTrue = true;
break;
case false:
hasFalse = true;
break;
}
}
if (hasTrue || hasFalse)
result[key] = hasFalse && hasTrue ? null : hasTrue ? true : false;
}
return /** @type {TargetProperties} */ (result);
};
/**
* @param {string[]} targets the targets
* @param {string} context the context directory
* @returns {TargetProperties} target properties
*/
const getTargetsProperties = (targets, context) => {
return mergeTargetProperties(
targets.map(t => getTargetProperties(t, context))
);
};
exports.getDefaultTarget = getDefaultTarget;
exports.getTargetProperties = getTargetProperties;
exports.getTargetsProperties = getTargetsProperties;
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