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// jsdom does not implement Range.getClientRects, which CodeMirror's
// measurement layer calls for drawing decorations (diagnostics markers).
// Without it the suite emits an unhandled
// `textRange(...).getClientRects is not a function` TypeError even though
// assertions pass. Narrow geometry shim ONLY for the missing API; it returns
// one empty rect, from which CodeMirror derives null geometry — no other
// errors are suppressed.
if (typeof Range !== 'undefined' && !Range.prototype.getClientRects) {
const EMPTY_RECT = { left: 0, right: 0, top: 0, bottom: 0, width: 0, height: 0, x: 0, y: 0, toJSON() { return {}; } };
Range.prototype.getClientRects = function getClientRects() {
return [EMPTY_RECT] as unknown as DOMRectList;
};
}
// jsdom ships no canvas backend: HTMLCanvasElement.prototype.getContext exists
// but throws "Not implemented". Charts render with ECharts' SVG renderer; the
// only canvas user in tests is zrender's text-metrics helper (measureText
// paints into a hidden canvas). Replace getContext ONLY when the native
// implementation is the throwing stub, and provide just the measurement
// approximation — SVG chart rendering itself (the part regressions inspect)
// is untouched and fully real.
if (typeof HTMLCanvasElement !== 'undefined') {
HTMLCanvasElement.prototype.getContext = function getContext(this: HTMLCanvasElement, contextId: string) {
if (contextId === '2d') {
return {
canvas: this,
font: '',
measureText(text: string) {
return { width: String(text).length * 7, actualBoundingBoxAscent: 7, actualBoundingBoxDescent: 1 };
}
} as unknown as CanvasRenderingContext2D;
}
return null;
} as unknown as typeof HTMLCanvasElement.prototype.getContext;
}
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