Add two simple perf helpers. (#3399)
Can be useful for ad-hoc measure of performance. One is a method decorator, which can be use on methods like so: ```typescript @measureDuration someLongRunningProccess() { // .... } ``` And the other offer more granular control. It also returns what the callback returns, so it can be use in assignments / return statements. ```typescript return measureCbDuration('sorting took', () => renderingShapes.sort(sortById)) ``` ### Change Type <!-- ❗ Please select a 'Scope' label ❗️ --> - [ ] `sdk` — Changes the tldraw SDK - [ ] `dotcom` — Changes the tldraw.com web app - [ ] `docs` — Changes to the documentation, examples, or templates. - [ ] `vs code` — Changes to the vscode plugin - [x] `internal` — Does not affect user-facing stuff <!-- ❗ Please select a 'Type' label ❗️ --> - [ ] `bugfix` — Bug fix - [ ] `feature` — New feature - [ ] `improvement` — Improving existing features - [ ] `chore` — Updating dependencies, other boring stuff - [ ] `galaxy brain` — Architectural changes - [ ] `tests` — Changes to any test code - [x] `tools` — Changes to infrastructure, CI, internal scripts, debugging tools, etc. - [ ] `dunno` — I don't know
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packages/utils/src/lib/perf.ts
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packages/utils/src/lib/perf.ts
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/** @internal */
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export function measureCbDuration(name: string, cb: () => any) {
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const now = performance.now()
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const result = cb()
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// eslint-disable-next-line no-console
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console.log(`${name} took`, performance.now() - now, 'ms')
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return result
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}
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/** @internal */
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export function measureDuration(_target: any, propertyKey: string, descriptor: PropertyDescriptor) {
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const originalMethod = descriptor.value
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descriptor.value = function (...args: any[]) {
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const start = performance.now()
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const result = originalMethod.apply(this, args)
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const end = performance.now()
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// eslint-disable-next-line no-console
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console.log(`${propertyKey} took ${end - start}ms `)
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return result
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}
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return descriptor
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}
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