/
index.ts
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/
index.ts
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import browserslist from "browserslist";
import { findSuggestion } from "@babel/helper-validator-option";
import browserModulesData from "@babel/compat-data/native-modules";
import LruCache from "lru-cache";
import {
semverify,
semverMin,
isUnreleasedVersion,
getLowestUnreleased,
getHighestUnreleased,
} from "./utils";
import { OptionValidator } from "@babel/helper-validator-option";
import { browserNameMap } from "./targets";
import { TargetNames } from "./options";
import type {
Target,
Targets,
InputTargets,
Browsers,
BrowserslistBrowserName,
TargetsTuple,
} from "./types";
export type { Target, Targets, InputTargets };
export { prettifyTargets } from "./pretty";
export { getInclusionReasons } from "./debug";
export { default as filterItems, isRequired } from "./filter-items";
export { unreleasedLabels } from "./targets";
export { TargetNames };
const ESM_SUPPORT = browserModulesData["es6.module"];
declare const PACKAGE_JSON: { name: string; version: string };
const v = new OptionValidator(PACKAGE_JSON.name);
function validateTargetNames(targets: Targets): TargetsTuple {
const validTargets = Object.keys(TargetNames);
for (const target of Object.keys(targets)) {
if (!(target in TargetNames)) {
throw new Error(
v.formatMessage(`'${target}' is not a valid target
- Did you mean '${findSuggestion(target, validTargets)}'?`),
);
}
}
return targets;
}
export function isBrowsersQueryValid(browsers: unknown): boolean {
return (
typeof browsers === "string" ||
(Array.isArray(browsers) && browsers.every(b => typeof b === "string"))
);
}
function validateBrowsers(browsers: Browsers | undefined) {
v.invariant(
browsers === undefined || isBrowsersQueryValid(browsers),
`'${String(browsers)}' is not a valid browserslist query`,
);
return browsers;
}
function getLowestVersions(browsers: Array<string>): Targets {
return browsers.reduce((all, browser) => {
const [browserName, browserVersion] = browser.split(" ") as [
BrowserslistBrowserName,
string,
];
const target = browserNameMap[browserName];
if (!target) {
return all;
}
try {
// Browser version can return as "10.0-10.2"
const splitVersion = browserVersion.split("-")[0].toLowerCase();
const isSplitUnreleased = isUnreleasedVersion(splitVersion, target);
if (!all[target]) {
all[target] = isSplitUnreleased
? splitVersion
: semverify(splitVersion);
return all;
}
const version = all[target];
const isUnreleased = isUnreleasedVersion(version, target);
if (isUnreleased && isSplitUnreleased) {
all[target] = getLowestUnreleased(version, splitVersion, target);
} else if (isUnreleased) {
all[target] = semverify(splitVersion);
} else if (!isUnreleased && !isSplitUnreleased) {
const parsedBrowserVersion = semverify(splitVersion);
all[target] = semverMin(version, parsedBrowserVersion);
}
} catch (e) {}
return all;
}, {} as Record<Target, string>);
}
function outputDecimalWarning(
decimalTargets: Array<{ target: string; value: number }>,
) {
if (!decimalTargets.length) {
return;
}
console.warn("Warning, the following targets are using a decimal version:\n");
decimalTargets.forEach(({ target, value }) =>
console.warn(` ${target}: ${value}`),
);
console.warn(`
We recommend using a string for minor/patch versions to avoid numbers like 6.10
getting parsed as 6.1, which can lead to unexpected behavior.
`);
}
function semverifyTarget(target: Target, value: string) {
try {
return semverify(value);
} catch (error) {
throw new Error(
v.formatMessage(
`'${value}' is not a valid value for 'targets.${target}'.`,
),
);
}
}
// Parse `node: true` and `node: "current"` to version
function nodeTargetParser(value: true | string) {
const parsed =
value === true || value === "current"
? process.versions.node
: semverifyTarget("node", value);
return ["node", parsed] as const;
}
function defaultTargetParser(
target: Exclude<Target, "node">,
value: string,
): readonly [Exclude<Target, "node">, string] {
const version = isUnreleasedVersion(value, target)
? value.toLowerCase()
: semverifyTarget(target, value);
return [target, version] as const;
}
function generateTargets(inputTargets: InputTargets): Targets {
const input = { ...inputTargets };
delete input.esmodules;
delete input.browsers;
return input;
}
function resolveTargets(queries: Browsers, env?: string): Targets {
const resolved = browserslist(queries, {
mobileToDesktop: true,
env,
});
return getLowestVersions(resolved);
}
const targetsCache = new LruCache({ max: 64 });
function resolveTargetsCached(queries: Browsers, env?: string): Targets {
const cacheKey = typeof queries === "string" ? queries : queries.join() + env;
let cached = targetsCache.get(cacheKey) as Targets | undefined;
if (!cached) {
cached = resolveTargets(queries, env);
targetsCache.set(cacheKey, cached);
}
return { ...cached };
}
type GetTargetsOption = {
// This is not the path of the config file, but the path where start searching it from
configPath?: string;
// The path of the config file
configFile?: string;
// The env to pass to browserslist
browserslistEnv?: string;
// true to disable config loading
ignoreBrowserslistConfig?: boolean;
};
export default function getTargets(
inputTargets: InputTargets = {},
options: GetTargetsOption = {},
): Targets {
let { browsers, esmodules } = inputTargets;
const { configPath = "." } = options;
validateBrowsers(browsers);
const input = generateTargets(inputTargets);
let targets = validateTargetNames(input);
const shouldParseBrowsers = !!browsers;
const hasTargets = shouldParseBrowsers || Object.keys(targets).length > 0;
const shouldSearchForConfig =
!options.ignoreBrowserslistConfig && !hasTargets;
if (!browsers && shouldSearchForConfig) {
browsers = browserslist.loadConfig({
config: options.configFile,
path: configPath,
env: options.browserslistEnv,
});
if (browsers == null) {
if (process.env.BABEL_8_BREAKING) {
// In Babel 8, if no targets are passed, we use browserslist's defaults
// and exclude IE 11.
browsers = ["defaults, not ie 11"];
} else {
// If no targets are passed, we need to overwrite browserslist's defaults
// so that we enable all transforms (acting like the now deprecated
// preset-latest).
browsers = [];
}
}
}
// `esmodules` as a target indicates the specific set of browsers supporting ES Modules.
// These values OVERRIDE the `browsers` field.
if (esmodules && (esmodules !== "intersect" || !browsers?.length)) {
browsers = Object.keys(ESM_SUPPORT)
.map(
(browser: keyof typeof ESM_SUPPORT) =>
`${browser} >= ${ESM_SUPPORT[browser]}`,
)
.join(", ");
esmodules = false;
}
// If current value of `browsers` is undefined (`ignoreBrowserslistConfig` should be `false`)
// or an empty array (without any user config, use default config),
// we don't need to call `resolveTargets` to execute the related methods of `browserslist` library.
if (browsers?.length) {
const queryBrowsers = resolveTargetsCached(
browsers,
options.browserslistEnv,
);
if (esmodules === "intersect") {
for (const browser of Object.keys(queryBrowsers) as Target[]) {
const version = queryBrowsers[browser];
const esmSupportVersion =
// @ts-expect-error ie is not in ESM_SUPPORT
ESM_SUPPORT[browser];
if (esmSupportVersion) {
queryBrowsers[browser] = getHighestUnreleased(
version,
semverify(esmSupportVersion),
browser,
);
} else {
delete queryBrowsers[browser];
}
}
}
targets = Object.assign(queryBrowsers, targets);
}
// Parse remaining targets
const result: Targets = {};
const decimalWarnings = [];
for (const target of Object.keys(targets).sort() as Target[]) {
const value = targets[target];
// Warn when specifying minor/patch as a decimal
if (typeof value === "number" && value % 1 !== 0) {
decimalWarnings.push({ target, value });
}
const [parsedTarget, parsedValue] =
target === "node"
? nodeTargetParser(value)
: defaultTargetParser(target, value as string);
if (parsedValue) {
// Merge (lowest wins)
result[parsedTarget] = parsedValue;
}
}
outputDecimalWarning(decimalWarnings);
return result;
}