preact/debug/src/check-props.js

Fast 3kb React-compatible Virtual DOM library.

const ReactPropTypesSecret = 'SECRET_DO_NOT_PASS_THIS_OR_YOU_WILL_BE_FIRED';

let loggedTypeFailures = {};

export function checkPropTypes(
	typeSpecs,
	values,
	location,
	componentName,
	getStack
) {
	Object.keys(typeSpecs).forEach(typeSpecName => {
		let error;
		try {
			error = typeSpecs[typeSpecName](
				values,
				typeSpecName,
				componentName,
				location,
				null,
				ReactPropTypesSecret
			);
		} catch (e) {
			error = e;
		}
		if (error && !(error.message in loggedTypeFailures)) {
			loggedTypeFailures[error.message] = true;
			console.error(
				`Failed ${location} type: ${error.message}${(getStack && getStack()) ||
					''}`
			);
		}
	});
}