Function checkDuplicateKeysInJson

src/keybindings/validate.ts:261–310

(
  jsonString: string,
)

 * and "enter" in Confirmation).
 */
export function checkDuplicateKeysInJson(
  jsonString: string,
): KeybindingWarning[] {
  const warnings: KeybindingWarning[] = []

  // Find each "bindings" block and check for duplicates within it
  // Pattern: "bindings" : { ... }
  const bindingsBlockPattern =
    /"bindings"\s*:\s*\{([^{}]*(?:\{[^{}]*\}[^{}]*)*)\}/g

  let blockMatch
  while ((blockMatch = bindingsBlockPattern.exec(jsonString)) !== null) {
    const blockContent = blockMatch[1]
    if (!blockContent) continue

    // Find the context for this block by looking backwards
    const textBeforeBlock = jsonString.slice(0, blockMatch.index)
    const contextMatch = textBeforeBlock.match(
      /"context"\s*:\s*"([^"]+)"[^{]*$/,
    )
    const context = contextMatch?.[1] ?? 'unknown'

    // Find all keys within this bindings block
    const keyPattern = /"([^"]+)"\s*:/g
    const keysByName = new Map<string, number>()

    let keyMatch
    while ((keyMatch = keyPattern.exec(blockContent)) !== null) {
      const key = keyMatch[1]
      if (!key) continue

      const count = (keysByName.get(key) ?? 0) + 1
      keysByName.set(key, count)

      if (count === 2) {
        // Only warn on the second occurrence
        warnings.push({
          type: 'duplicate',
          severity: 'warning',
          message: `Duplicate key "${key}" in ${context} bindings`,
          key,
          context,
          suggestion: `This key appears multiple times in the same context. JSON uses the last value, earlier values are ignored.`,
        })
      }
    }
  }

  return warnings
}

/**
 * Validate user keybinding config and return all warnings.