src/hero.mjs: Better handling of default values for arguments

Now one can give a partial specification of the object and still get the
other attributes to have their default values.

1 files changed, 10 insertions, 20 deletions

diff --git a/src/hero.mjs b/src/hero.mjs
index 7ac7c19..451198d 100644
--- a/src/hero.mjs
+++ b/src/hero.mjs
@@ -178,12 +178,9 @@ export const makeLogger = (writerFn = console.error) => ({
 export const log = makeLogger();
 
 export const interceptorsFn = ({
-	uuidFn,
-	logger,
-} = {
-	uuidFn: crypto.randomUUID,
-	logger: log,
-}) => ({
+	uuidFn = crypto.randomUUID,
+	logger = log,
+} = {}) => ({
 	requestId: (req, next) => next({ ...req, id: uuidFn() }),
 	logged: async (req, next) => {
 		const { id, url, method } = req;
@@ -256,10 +253,8 @@ export const wrapHandler = (fn, arr) =>
 		chainInterceptors(arr.concat([ (req, _next) => fn(req) ]));
 
 export const actionsFn = ({
-	logger,
-} = {
-	logger: log,
-}) => ({
+	logger = log,
+} = {}) => ({
 	"toggle-debug-env": action => {
 		const before = process.env.DEBUG;
 		if (process.env.DEBUG) {
@@ -291,12 +286,9 @@ export const actionsFn = ({
 export const actions = actionsFn();
 
 export const lineHandlerFn = ({
-	logger,
-	actionsMap,
-} = {
-	logger: log,
-	actionsMap: actions,
-}) => line => {
+	logger     = log,
+	actionsMap = actions,
+} = {}) => line => {
 	let cmd = null;
 	try {
 		cmd = JSON.parse(line);
@@ -359,10 +351,8 @@ export const makeLineEmitter = fn => {
 };
 
 export const makePipeReaderFn = ({
-	lineFn,
-} = {
-	lineFn: lineHandler
-}) => path => {
+	lineFn = lineHandler,
+} = {}) => path => {
 	mkfifo(path);
 	fs.createReadStream(path, "UTF-8").on("data", makeLineEmitter(lineFn));
 };