/
createAction.js
66 lines (57 loc) · 1.58 KB
/
createAction.js
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import validator from 'is-my-json-valid';
function identity(value) {
return value;
}
function isValidator(spec) {
return typeof spec === 'object' && !(spec instanceof Array);
}
function validatedIdentity(schema, name) {
const validate = validator(schema);
return value => {
if (validate(value)) {
return value;
}
const { field, message } = validate.errors[0];
return new Error(`${field.replace(/^data/, name)} ${message}`);
};
}
function propertyCreator(spec, name) {
if (typeof spec === 'boolean') {
return spec ? identity : undefined;
}
if (typeof spec === 'function') {
return spec;
}
if (typeof spec === 'object' && spec instanceof Array) {
return (data) => spec.reduce((res, prop) => {
return {
...res,
[prop]: data[prop],
};
}, {});
}
if (isValidator(spec)) {
return validatedIdentity(spec, name);
}
return undefined;
}
export default function createAction(type, payloadSpec, metaSpec) {
const payloadCreator = propertyCreator(payloadSpec, 'payload');
const metaCreator = propertyCreator(metaSpec, 'meta');
function actionCreator(payload, meta) {
const action = { type };
if (typeof payloadCreator === 'function') {
action.payload = payloadCreator(payload);
if (action.payload instanceof Error) {
action.error = true;
}
}
if (typeof metaCreator === 'function') {
action.meta = metaCreator(meta);
}
return action;
}
// NOTE: use Symbol.toPrimitive when it's well supported
actionCreator.toString = () => type;
return actionCreator;
}