Function extensionFor

packages/core/src/extension-point.ts:267–292

(
  ...extensionPointNames: string[]
)

 * @param extensionPointNames - Names of the extension point
 */
export function extensionFor(
  ...extensionPointNames: string[]
): BindingTemplate {
  return binding => {
    if (extensionPointNames.length === 0) return;
    let extensionPoints = binding.tagMap[CoreTags.EXTENSION_FOR];
    // Normalize extensionPoints to string[]
    if (extensionPoints == null) {
      extensionPoints = [];
    } else if (typeof extensionPoints === 'string') {
      extensionPoints = [extensionPoints];
    }

    // Add extension points
    for (const extensionPointName of extensionPointNames) {
      if (!extensionPoints.includes(extensionPointName)) {
        extensionPoints.push(extensionPointName);
      }
    }
    if (extensionPoints.length === 1) {
      // Keep the value as string for backward compatibility
      extensionPoints = extensionPoints[0];
    }
    binding.tag({[CoreTags.EXTENSION_FOR]: extensionPoints});
  };
}

/**
 * Register an extension for the given extension point to the context