Function setSignature

packages/react-refresh/src/ReactFreshRuntime.js:346–377

(
  type: any,
  key: string,
  forceReset?: boolean = false,
  getCustomHooks?: () => Array<Function>,
)

}

export function setSignature(
  type: any,
  key: string,
  forceReset?: boolean = false,
  getCustomHooks?: () => Array<Function>,
): void {
  if (__DEV__) {
    if (!allSignaturesByType.has(type)) {
      allSignaturesByType.set(type, {
        forceReset,
        ownKey: key,
        fullKey: null,
        getCustomHooks: getCustomHooks || (() => []),
      });
    }
    // Visit inner types because we might not have signed them.
    if (typeof type === 'object' && type !== null) {
      switch (getProperty(type, '$$typeof')) {
        case REACT_FORWARD_REF_TYPE:
          setSignature(type.render, key, forceReset, getCustomHooks);
          break;
        case REACT_MEMO_TYPE:
          setSignature(type.type, key, forceReset, getCustomHooks);
          break;
      }
    }
  } else {
    throw new Error(
      'Unexpected call to React Refresh in a production environment.',
    );
  }
}

// This is lazily called during first render for a type.
// It captures Hook list at that time so inline requires don't break comparisons.