normalizeConsoleFormat() — react Function Reference

Architecture documentation for the normalizeConsoleFormat() function in normalizeConsoleFormat.js from the react codebase.

Function javascript BabelCompiler Entrypoint

Entity Profile

BabelCompiler→ Entrypoint→ normalizeConsoleFormat() — react Function Reference

Dependency Diagram

graph TD
  3bfa494c_3228_0a0e_6545_aa3d6c422c23["normalizeConsoleFormat()"]
  e338eb30_b125_7ab9_0a2c_4b6694754e96["normalizeConsoleFormat.js"]
  3bfa494c_3228_0a0e_6545_aa3d6c422c23 -->|defined in| e338eb30_b125_7ab9_0a2c_4b6694754e96
  style 3bfa494c_3228_0a0e_6545_aa3d6c422c23 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

packages/shared/normalizeConsoleFormat.js lines 13–56

export default function normalizeConsoleFormat(
  formatString: string,
  args: $ReadOnlyArray<mixed>,
  firstArg: number,
): string {
  let j = firstArg;
  let normalizedString = '';
  let last = 0;
  for (let i = 0; i < formatString.length - 1; i++) {
    if (formatString.charCodeAt(i) !== 37 /* "%" */) {
      continue;
    }
    switch (formatString.charCodeAt(++i)) {
      case 79 /* "O" */:
      case 99 /* "c" */:
      case 100 /* "d" */:
      case 102 /* "f" */:
      case 105 /* "i" */:
      case 111 /* "o" */:
      case 115 /* "s" */: {
        if (j < args.length) {
          // We have a matching argument.
          j++;
        } else {
          // We have more format specifiers than arguments.
          // So we need to escape this to print the literal.
          normalizedString += formatString.slice(last, (last = i)) + '%';
        }
      }
    }
  }
  normalizedString += formatString.slice(last, formatString.length);
  // Pad with extra format specifiers for the rest.
  while (j < args.length) {
    if (normalizedString !== '') {
      normalizedString += ' ';
    }
    // Not every environment has the same default.
    // This seems to be what Chrome DevTools defaults to.
    normalizedString += typeof args[j] === 'string' ? '%s' : '%o';
    j++;
  }
  return normalizedString;
}