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