immortaly007andClaude Opus 5.5
bec28fd0c1
Load OpenCV in the browser via a script tag: the bundler's CJS interop copies the module's then() onto the import namespace, which never settles. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
38 lines
1.5 KiB
TypeScript
38 lines
1.5 KiB
TypeScript
export type CV = typeof import('@techstark/opencv-js');
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// Everything returns { cv }: the cv module is a thenable, so resolving with it directly never settles.
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let loading: Promise<{ cv: CV }> | null = null;
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export function loadOpenCV(): Promise<{ cv: CV }> {
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loading ??= (async () => {
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const { cv } = typeof document === 'undefined' ? await importModule() : await loadScript();
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if (!cv.Mat) {
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await new Promise<void>((resolve) => {
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(cv as unknown as { onRuntimeInitialized: () => void }).onRuntimeInitialized = () => resolve();
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});
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}
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return { cv };
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})();
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return loading;
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}
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/** Node (tests). The variable specifier keeps the bundler from emitting a second OpenCV chunk. */
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async function importModule(): Promise<{ cv: CV }> {
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const specifier = '@techstark/opencv-js';
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const mod = (await import(/* @vite-ignore */ specifier)) as { default: CV };
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return { cv: mod.default };
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}
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// A script tag, not import(): bundler CJS interop copies `then` and the import never settles.
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async function loadScript(): Promise<{ cv: CV }> {
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const { default: url } = await import('@techstark/opencv-js/dist/opencv.js?url');
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await new Promise<void>((resolve, reject) => {
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const script = document.createElement('script');
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script.src = url;
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script.onload = () => resolve();
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script.onerror = () => reject(new Error('Failed to load OpenCV'));
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document.head.append(script);
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});
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return { cv: (window as unknown as { cv: CV }).cv };
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}
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