46 lines
1.2 KiB
TypeScript
46 lines
1.2 KiB
TypeScript
/**
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* Use invariant() to assert state which your program assumes to be true.
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*
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* Provide sprintf-style format (only %s is supported) and arguments
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* to provide information about what broke and what you were
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* expecting.
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*
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* The invariant message will be stripped in production, but the invariant
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* will remain to ensure logic does not differ in production.
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*/
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export function invariant(condition: any, format: string, ...args: any[]) {
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if (isProduction()) {
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if (format === undefined) {
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throw new Error('invariant requires an error message argument')
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}
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}
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if (!condition) {
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let error
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if (format === undefined) {
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error = new Error(
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'Minified exception occurred; use the non-minified dev environment ' +
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'for the full error message and additional helpful warnings.',
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)
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} else {
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let argIndex = 0
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error = new Error(
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format.replace(/%s/g, function () {
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return args[argIndex++]
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}),
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)
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error.name = 'Invariant Violation'
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}
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;(error as any).framesToPop = 1 // we don't care about invariant's own frame
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throw error
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}
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}
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function isProduction() {
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return (
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typeof process !== 'undefined' && process.env['NODE_ENV'] === 'production'
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)
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}
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