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Fix is.class for minified class expression (#217)

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Tim Griesser 2025-10-31 13:18:25 -04:00 • committed by GitHub
parent d22ab62991
commit e7c84fcb79
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2 changed files with 5 additions and 1 deletions
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2
source/index.ts
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@ -418,7 +418,7 @@ export function isBuffer(value: unknown): value is NodeBuffer {
}
export function isClass<T = unknown>(value: unknown): value is Class<T> {
return isFunction(value) && value.toString().startsWith('class ');
return isFunction(value) && /^class(\s+|{)/.test(value.toString());
}
export function isDataView(value: unknown): value is DataView {

4
test/test.ts
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@ -1086,9 +1086,13 @@ test('is.asyncIterable', t => {
test('is.class', t => {
class Foo {} // eslint-disable-line @typescript-eslint/no-extraneous-class
// Note: Using new Function to prevent whitespace modifications in tsimp
const minifiedClass = new Function('return class{};'); // eslint-disable-line no-new-func
const classDeclarations = [
Foo,
class Bar extends Foo {},
minifiedClass(),
];
for (const classDeclaration of classDeclarations) {