96 lines
2.6 KiB
JavaScript
96 lines
2.6 KiB
JavaScript
export function declare(builder) {
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return (api, options, dirname) => {
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if (!api.assertVersion) {
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// Inject a custom version of 'assertVersion' for Babel 6 and early
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// versions of Babel 7's beta that didn't have it.
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api = Object.assign(copyApiObject(api), {
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assertVersion(range) {
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throwVersionError(range, api.version);
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},
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});
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}
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return builder(api, options || {}, dirname);
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};
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}
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function copyApiObject(api) {
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// Babel >= 7 <= beta.41 passed the API as a new object that had
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// babel/core as the prototype. While slightly faster, it also
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// means that the Object.assign copy below fails. Rather than
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// keep complexity, the Babel 6 behavior has been reverted and this
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// normalizes all that for Babel 7.
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let proto = null;
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if (typeof api.version === "string" && /^7\./.test(api.version)) {
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proto = Object.getPrototypeOf(api);
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if (
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proto &&
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(!has(proto, "version") ||
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!has(proto, "transform") ||
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!has(proto, "template") ||
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!has(proto, "types"))
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) {
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proto = null;
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}
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}
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return {
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...proto,
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...api,
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};
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}
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function has(obj, key) {
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return Object.prototype.hasOwnProperty.call(obj, key);
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}
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function throwVersionError(range, version) {
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if (typeof range === "number") {
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if (!Number.isInteger(range)) {
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throw new Error("Expected string or integer value.");
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}
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range = `^${range}.0.0-0`;
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}
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if (typeof range !== "string") {
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throw new Error("Expected string or integer value.");
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}
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const limit = Error.stackTraceLimit;
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if (typeof limit === "number" && limit < 25) {
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// Bump up the limit if needed so that users are more likely
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// to be able to see what is calling Babel.
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Error.stackTraceLimit = 25;
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}
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let err;
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if (version.slice(0, 2) === "7.") {
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err = new Error(
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`Requires Babel "^7.0.0-beta.41", but was loaded with "${version}". ` +
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`You'll need to update your @babel/core version.`,
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);
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} else {
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err = new Error(
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`Requires Babel "${range}", but was loaded with "${version}". ` +
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`If you are sure you have a compatible version of @babel/core, ` +
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`it is likely that something in your build process is loading the ` +
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`wrong version. Inspect the stack trace of this error to look for ` +
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`the first entry that doesn't mention "@babel/core" or "babel-core" ` +
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`to see what is calling Babel.`,
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);
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}
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if (typeof limit === "number") {
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Error.stackTraceLimit = limit;
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}
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throw Object.assign(
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err,
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({
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code: "BABEL_VERSION_UNSUPPORTED",
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version,
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range,
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}: any),
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);
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}
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