70 lines
2.2 KiB
TypeScript
70 lines
2.2 KiB
TypeScript
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const TypedArrayPrototypeGetSymbolToStringTag = (() => {
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// Type check system lovingly referenced from:
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// https://github.com/nodejs/node/blob/7450332339ed40481f470df2a3014e2ec355d8d8/lib/internal/util/types.js#L13-L15
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// eslint-disable-next-line @typescript-eslint/unbound-method -- the intention is to call this method with a bound value
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const g = Object.getOwnPropertyDescriptor(
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Object.getPrototypeOf(Uint8Array.prototype),
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Symbol.toStringTag
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)!.get!;
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return (value: unknown) => g.call(value);
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})();
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export function isUint8Array(value: unknown): value is Uint8Array {
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return TypedArrayPrototypeGetSymbolToStringTag(value) === 'Uint8Array';
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}
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export function isAnyArrayBuffer(value: unknown): value is ArrayBuffer {
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return (
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typeof value === 'object' &&
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value != null &&
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Symbol.toStringTag in value &&
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(value[Symbol.toStringTag] === 'ArrayBuffer' ||
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value[Symbol.toStringTag] === 'SharedArrayBuffer')
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);
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}
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export function isRegExp(regexp: unknown): regexp is RegExp {
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return regexp instanceof RegExp || Object.prototype.toString.call(regexp) === '[object RegExp]';
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}
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export function isMap(value: unknown): value is Map<unknown, unknown> {
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return (
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typeof value === 'object' &&
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value != null &&
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Symbol.toStringTag in value &&
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value[Symbol.toStringTag] === 'Map'
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);
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}
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export function isDate(date: unknown): date is Date {
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return date instanceof Date || Object.prototype.toString.call(date) === '[object Date]';
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}
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export type InspectFn = (x: unknown, options?: unknown) => string;
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export function defaultInspect(x: unknown, _options?: unknown): string {
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return JSON.stringify(x, (k: string, v: unknown) => {
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if (typeof v === 'bigint') {
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return { $numberLong: `${v}` };
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} else if (isMap(v)) {
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return Object.fromEntries(v);
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}
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return v;
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});
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}
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/** @internal */
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type StylizeFunction = (x: string, style: string) => string;
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/** @internal */
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export function getStylizeFunction(options?: unknown): StylizeFunction | undefined {
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const stylizeExists =
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options != null &&
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typeof options === 'object' &&
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'stylize' in options &&
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typeof options.stylize === 'function';
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if (stylizeExists) {
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return options.stylize as StylizeFunction;
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}
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}
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