bc518174
 王天杨
提交两个项目文件
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/**
* Use invariant() to assert state which your program assumes to be true.
*
* Provide sprintf-style format (only %s is supported) and arguments
* to provide information about what broke and what you were
* expecting.
*
* The invariant message will be stripped in production, but the invariant
* will remain to ensure logic does not differ in production.
*/ export function invariant(condition, format, ...args) {
if (isProduction()) {
if (format === undefined) {
throw new Error('invariant requires an error message argument');
}
}
if (!condition) {
let error;
if (format === undefined) {
error = new Error('Minified exception occurred; use the non-minified dev environment ' + 'for the full error message and additional helpful warnings.');
} else {
let argIndex = 0;
error = new Error(format.replace(/%s/g, function() {
return args[argIndex++];
}));
error.name = 'Invariant Violation';
}
error.framesToPop = 1 // we don't care about invariant's own frame
;
throw error;
}
}
function isProduction() {
return typeof process !== 'undefined' && process.env['NODE_ENV'] === 'production';
}
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