[Flow] update to 57

.flowconfig

@@ -7,6 +7,7 @@
 .*node_modules/config-chain.*
 .*node_modules/documentation.*
 .*node_modules/devtools-reps/src/object-inspector/index.js
+.*node_modules/immutable/dist/immutable.js.flow
 .*node_modules/jest-in-case/index.js
 <PROJECT_ROOT>/firefox/.*
 .*mozilla-central/.*

package.json

@@ -126,7 +126,7 @@
     "eslint-plugin-prettier": "^2.3.1",
     "eslint-plugin-react": "^7.2.1",
     "expect.js": "^0.3.1",
-    "flow-bin": "0.53.0",
+    "flow-bin": "0.57.3",
     "github-airtable-bridge": "0.0.5",
     "glob": "^7.0.3",
     "husky": "^0.14.2",

src/actions/utils/middleware/promise.js

@@ -19,7 +19,10 @@ function filterAction(action: Object): Object {
   return fromPairs(toPairs(action).filter(pair => pair[0] !== PROMISE));
 }
 
-function promiseMiddleware({ dispatch, getState }: ThunkArgs) {
+function promiseMiddleware({
+  dispatch,
+  getState
+}: ThunkArgs): Function | Promise<mixed> {
   return (next: Function) => (action: Object) => {
     if (!(PROMISE in action)) {
       return next(action);

src/client/chrome/commands.js

@@ -103,7 +103,7 @@ function evaluate(script: string) {
   return runtimeAgent.evaluate({ expression: script });
 }
 
-function debuggeeCommand(script: string) {
+function debuggeeCommand(script: string): Promise<void> {
   evaluate(script);
   return Promise.resolve();
 }

src/client/firefox/commands.js

@@ -130,7 +130,9 @@ function setBreakpoint(
     });
 }
 
-function removeBreakpoint(generatedLocation: Location) {
+function removeBreakpoint(
+  generatedLocation: Location
+): Promise<void> | ?BreakpointResult {
   try {
     const id = makeLocationId(generatedLocation);
     const bpClient = bpClients[id];
@@ -166,7 +168,7 @@ type EvaluateParam = {
   frameId?: FrameId
 };
 
-function evaluate(script: Script, { frameId }: EvaluateParam) {
+function evaluate(script: Script, { frameId }: EvaluateParam): Promise<mixed> {
   const params = frameId ? { frameActor: frameId } : {};
   if (!tabTarget || !tabTarget.activeConsole) {
     return Promise.resolve();
@@ -181,7 +183,7 @@ function evaluate(script: Script, { frameId }: EvaluateParam) {
   });
 }
 
-function debuggeeCommand(script: Script) {
+function debuggeeCommand(script: Script): ?Promise<void> {
   tabTarget.activeConsole.evaluateJS(script, () => {}, {});
 
   if (!debuggerClient) {

src/utils/test-head.js

@@ -77,7 +77,7 @@ function makeSymbolDeclaration(name: string, line: number) {
  * @memberof utils/test-head
  * @static
  */
-function waitForState(store: any, predicate: any) {
+function waitForState(store: any, predicate: any): Promise<void> {
   return new Promise(resolve => {
     const unsubscribe = store.subscribe(() => {
       if (predicate(store.getState())) {

src/utils/utils.js

@@ -21,7 +21,7 @@ function handleError(err: any) {
  * @memberof utils/utils
  * @static
  */
-function promisify(context: any, method: any, ...args: any) {
+function promisify(context: any, method: any, ...args: any): Promise<mixed> {
   return new Promise((resolve, reject) => {
     args.push(response => {
       if (response.error) {
@@ -66,7 +66,7 @@ function throttle(func: any, ms: number) {
   };
 }
 
-function waitForMs(ms: number) {
+function waitForMs(ms: number): Promise<void> {
   return new Promise(resolve => setTimeout(resolve, ms));
 }
 

src/utils/wasm.js

@@ -12,6 +12,7 @@ type WasmState = {
   offsets: Array<number>
 };
 
+// $FlowIgnore
 var wasmStates: { [string]: WasmState } = Object.create(null);
 
 /**