Function testSubtree has a Cognitive Complexity of 82 (exceeds 5 allowed). Consider refactoring.

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const testSubtree = (value, pattern) => {

  // Match anything!
  if (pattern === Match.Any) {
    return false;

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Function testSubtree has 197 lines of code (exceeds 25 allowed). Consider refactoring.

Open

const testSubtree = (value, pattern) => {

  // Match anything!
  if (pattern === Match.Any) {
    return false;

File match.js has 370 lines of code (exceeds 250 allowed). Consider refactoring.

Open

// XXX docs
import { isPlainObject } from './isPlainObject';

// Things we explicitly do NOT support:
//    - heterogenous arrays

Avoid deeply nested control flow statements.

Open

        if (result) {
          result.path = _prependPath(key, result.path);
          return result;
        }

Avoid too many return statements within this function.

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    return {
      message: `Expected null, got ${stringForErrorMessage(value)}`,
      path: '',
    };

Avoid too many return statements within this function.

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        return false;

Avoid too many return statements within this function.

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  return EJSON.stringify(value);

Avoid too many return statements within this function.

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    return false;

Avoid too many return statements within this function.

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      return {
        message: `Bad pattern: arrays must have one type element ${stringForErrorMessage(pattern)}`,
        path: '',
      };

Avoid too many return statements within this function.

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    return {
      message: `Missing key '${keys[0]}'`,
      path: '',
    };

Avoid too many return statements within this function.

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        return result;

Avoid too many return statements within this function.

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    return {
      message: 'Failed Match.Where validation',
      path: '',
    };

Avoid too many return statements within this function.

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      return false;

Avoid too many return statements within this function.

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        return result;

Avoid too many return statements within this function.

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      return false;

Avoid too many return statements within this function.

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          return result;

Avoid too many return statements within this function.

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      return false;

Avoid too many return statements within this function.

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    return {
      message: `Expected object, got ${typeof value}`,
      path: '',
    };

Avoid too many return statements within this function.

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      return {
        message: err.message,
        path: err.path
      };

Avoid too many return statements within this function.

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    return {
      message: `Expected object, got null`,
      path: '',
    };

Avoid too many return statements within this function.

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        return result;

Avoid too many return statements within this function.

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    return {
      message: `Expected ${pattern}, got ${stringForErrorMessage(value)}`,
      path: '',
    };

Avoid too many return statements within this function.

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    return {
      message: 'Failed Match.OneOf, Match.Maybe or Match.Optional validation',
      path: '',
    };

Avoid too many return statements within this function.

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    return {
      message: `Expected plain object`,
      path: '',
    };

Avoid too many return statements within this function.

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    return {
      message: 'Bad pattern: unknown pattern type',
      path: '',
    };

Avoid too many return statements within this function.

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      return false;

Avoid too many return statements within this function.

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      return {
        message: `Expected array, got ${stringForErrorMessage(value)}`,
        path: '',
      };

Avoid too many return statements within this function.

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    return {
      message: `Expected ${pattern.name || 'particular constructor'}`,
      path: '',
    };

Avoid too many return statements within this function.

Open

    return {
      message: `Expected Integer, got ${stringForErrorMessage(value)}`,
      path: '',
    };

Avoid too many return statements within this function.

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        return {
          message: 'Unknown key',
          path: key,
        };

Function stringForErrorMessage has a Cognitive Complexity of 6 (exceeds 5 allowed). Consider refactoring.

Open

const stringForErrorMessage = (value, options = {}) => {
  if ( value === null ) {
    return 'null';
  }

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