@simplux/core
Version:
The core package of simplux. Contains everything to manage your application state in a simple way.
142 lines (141 loc) • 23.1 kB
JavaScript
/**
* Helper symbol used for identifying simplux mutation objects.
*
* @public
*/
// should really be a symbol, but as of TypeScript 4.1 there is a bug
// that causes the symbol to not be properly re-exported in type
// definitions when spreading a mutation object onto an export, which can
// cause issues with composite builds
export const SIMPLUX_MUTATION = '[SIMPLUX_MUTATION]';
/**
* Create new mutations for the module. A mutation is a function
* that takes the module state and optionally additional parameters
* and updates the state.
*
* @param simpluxModule - the module to create mutations for
* @param mutationDefinitions - the mutations to create
*
* @returns an object that contains a function for each provided
* mutation which when called will execute the mutation on the module
*
* @public
*/
export function createMutations(simpluxModule, mutationDefinitions) {
const module = simpluxModule;
const { name: moduleName, dispatch, getReducer, mutations } = module.$simplux;
if (process.env.NODE_ENV !== 'production') {
for (const mutationName of Object.keys(mutationDefinitions)) {
if (mutations[mutationName]) {
throw new Error(`mutation '${mutationName}' is already defined for module '${moduleName}'`);
}
}
}
Object.assign(mutations, mutationDefinitions);
let currentlyDispatchingMutationName;
const resolvedMutations = Object.keys(mutationDefinitions).reduce((acc, mutationName) => {
const type = `@simplux/${moduleName}/mutation/${mutationName}`;
function createAction(...allArgs) {
const args = filterEventArgs(allArgs);
if (process.env.NODE_ENV !== 'production') {
if (args.some((arg) => typeof arg === 'function')) {
throw new Error(
// tslint:disable-next-line: max-line-length
`mutation '${mutationName}' was called with a function argument; mutation arguments must be serializable, therefore functions are not supported`);
}
}
return { type, mutationName, args };
}
const mutation = nameFunction(mutationName, (...args) => {
var _a;
const mock = (_a = module.$simplux.mutationMocks) === null || _a === void 0 ? void 0 : _a[mutationName];
if (mock) {
return mock(...args);
}
if (process.env.NODE_ENV !== 'production') {
if (currentlyDispatchingMutationName) {
throw new Error(
// tslint:disable-next-line: max-line-length
`mutation '${mutationName}' was attempted to be dispatched from within mutation '${currentlyDispatchingMutationName}' which is not allowed; instead use '${mutationName}.withState(...)' to call the mutation without a dispatch`);
}
}
currentlyDispatchingMutationName = mutationName;
dispatch(createAction(...args));
currentlyDispatchingMutationName = undefined;
return module.state();
});
acc[mutationName] = mutation;
const extras = mutation;
extras.withState = (state, ...args) => {
return getReducer()(state, createAction(...args));
};
extras.asAction = createAction;
extras.type = type;
extras.mutationName = mutationName;
extras.owningModule = module;
extras[SIMPLUX_MUTATION] = '';
return acc;
}, {});
return resolvedMutations;
// this helper function allows creating a function with a dynamic name (only works with ES6+)
function nameFunction(name, body) {
return {
[name](...args) {
return body(...args);
},
}[name];
}
}
// a very common use case for mutations in frontend applications is to
// use them as event handlers for HTML elements like buttons; if the
// mutation has no arguments and is passed directly as an event handler
// (e.g. in React applications: onClick={myMutation}) it will get the
// HTML event passed as an argument; we believe that in 99.99999% of
// all cases where this happens we do not want that arg; therefore, we
// filter any argument here that looks like an HTML event; if someone
// needs an event as an arg, they can just wrap it in an object or
// tuple as a workaround; we are not mentioning this in the docs, since
// it is such an edge case and we can just tell people about the work-
// around when they create a bug report
function filterEventArgs(args) {
if (args.length === 0) {
return args;
}
if (isEvent(args[0])) {
return args.slice(1);
}
return args;
}
function isEvent(arg) {
// tslint:disable-next-line: strict-type-predicates
if (typeof Event !== 'undefined' && arg instanceof Event) {
return true;
}
if (arg === null || arg === undefined) {
return false;
}
// check if it looks like an event
if (hasProp(arg, 'target') &&
hasProp(arg, 'currentTarget') &&
hasProp(arg, 'defaultPrevented')) {
return true;
}
return false;
function hasProp(arg, name) {
return Object.prototype.hasOwnProperty.call(arg, name);
}
}
/**
* Checks if an object is a simplux mutation.
*
* @param object - the object to check
*
* @returns true if the object is a simplux mutation
*
* @internal
*/
export function _isSimpluxMutation(object) {
var _a;
return ((_a = object) === null || _a === void 0 ? void 0 : _a[SIMPLUX_MUTATION]) === '';
}
//# sourceMappingURL=data:application/json;base64,{"version":3,"file":"mutations.js","sources":["@simplux/core/src/mutations.ts"],"sourcesContent":["import type { SimpluxModule, SimpluxModuleMarker } from './module.js'\n\n/**\n * Helper symbol used for identifying simplux mutation objects.\n *\n * @public\n */\n// should really be a symbol, but as of TypeScript 4.1 there is a bug\n// that causes the symbol to not be properly re-exported in type\n// definitions when spreading a mutation object onto an export, which can\n// cause issues with composite builds\nexport const SIMPLUX_MUTATION = '[SIMPLUX_MUTATION]'\n\n/**\n * A function to turn into a mutation.\n *\n * @public\n */\nexport type MutationDefinition<TState> = (\n  state: TState,\n  ...args: any\n) => TState | void\n\n/**\n * The functions to turn into mutations.\n *\n * @public\n */\nexport interface MutationDefinitions<TState> {\n  [name: string]: MutationDefinition<TState>\n}\n\n/**\n * Interface for efficiently identifying simplux mutation objects at compile time.\n *\n * @public\n */\nexport interface SimpluxMutationMarker<TState, TArgs extends any[]> {\n  /**\n   * A symbol that allows efficient compile-time and run-time identification\n   * of simplux mutation objects.\n   *\n   * This property will have an `undefined` value at runtime.\n   *\n   * @public\n   */\n  readonly [SIMPLUX_MUTATION]: [TState, TArgs]\n}\n\n/**\n * A simplux mutation is a function that updates a module's state.\n *\n * @public\n */\nexport interface SimpluxMutation<TState, TArgs extends any[]>\n  extends SimpluxMutationMarker<TState, TArgs> {\n  // this signature does not have a TSDoc comment on purpose to allow\n  // consumers to define their own docs for their mutations (which would\n  // be overwritten if this signature had a TSDoc comment)\n  (...args: TArgs): TState\n\n  /**\n   * A unique identifier for this type of mutation.\n   *\n   * @internal\n   */\n  readonly type: string\n\n  /**\n   * The name of this mutation.\n   */\n  readonly mutationName: string\n\n  /**\n   * When a mutation is called directly it updates the module's state.\n   * Sometimes (e.g. for testing) it is useful to call the mutation\n   * with a given state. In this case no changes are made to the module.\n   *\n   * @param state - the state to use when executing the mutation\n   * @param args - the arguments for the mutation\n   *\n   * @returns the updated state\n   */\n  readonly withState: (state: TState, ...args: TArgs) => TState\n\n  /**\n   * When a mutation is called directly it updates the module's state by\n   * dispatching a redux action to the store. Sometimes it is useful to\n   * instead handle the action yourself instead of having simplux dispatch\n   * it automatically. This function returns the redux action instead of\n   * dispatching it.\n   *\n   * @param args - the arguments for the mutation\n   *\n   * @returns a redux action object\n   */\n  readonly asAction: (...args: TArgs) => { type: string; args: TArgs }\n\n  /**\n   * The module this mutation belongs to.\n   *\n   * @internal\n   */\n  readonly owningModule: SimpluxModule<TState>\n}\n\ntype ShallowMutable<T> = { -readonly [prop in keyof T]: T[prop] }\n\n/**\n * A simplux mutation is a function that updates a module's state.\n * {@link SimpluxMutation}\n *\n * @public\n */\nexport type ResolvedMutation<\n  TState,\n  TMutation extends MutationDefinition<TState>\n> = TMutation extends (state: TState, ...args: infer TArgs) => TState | void\n  ? SimpluxMutation<TState, TArgs>\n  : never\n\n/**\n * A collection of simplux mutations.\n *\n * @public\n */\nexport type SimpluxMutations<\n  TState,\n  TMutations extends MutationDefinitions<TState>\n> = {\n  readonly [name in keyof TMutations]: ResolvedMutation<\n    TState,\n    TMutations[name]\n  >\n}\n\n/**\n * Create new mutations for the module. A mutation is a function\n * that takes the module state and optionally additional parameters\n * and updates the state.\n *\n * @param simpluxModule - the module to create mutations for\n * @param mutationDefinitions - the mutations to create\n *\n * @returns an object that contains a function for each provided\n * mutation which when called will execute the mutation on the module\n *\n * @public\n */\nexport function createMutations<\n  TState,\n  TMutations extends MutationDefinitions<TState>\n>(\n  simpluxModule: SimpluxModuleMarker<TState>,\n  mutationDefinitions: TMutations,\n): SimpluxMutations<TState, TMutations> {\n  const module = simpluxModule as SimpluxModule<TState>\n\n  const { name: moduleName, dispatch, getReducer, mutations } = module.$simplux\n\n  if (process.env.NODE_ENV !== 'production') {\n    for (const mutationName of Object.keys(mutationDefinitions)) {\n      if (mutations[mutationName]) {\n        throw new Error(\n          `mutation '${mutationName}' is already defined for module '${moduleName}'`,\n        )\n      }\n    }\n  }\n\n  Object.assign(mutations, mutationDefinitions)\n\n  let currentlyDispatchingMutationName: string | undefined\n\n  const resolvedMutations = Object.keys(mutationDefinitions).reduce(\n    (acc, mutationName: keyof TMutations) => {\n      const type = `@simplux/${moduleName}/mutation/${mutationName}`\n\n      function createAction(...allArgs: any[]) {\n        const args = filterEventArgs(allArgs)\n\n        if (process.env.NODE_ENV !== 'production') {\n          if (args.some((arg) => typeof arg === 'function')) {\n            throw new Error(\n              // tslint:disable-next-line: max-line-length\n              `mutation '${mutationName}' was called with a function argument; mutation arguments must be serializable, therefore functions are not supported`,\n            )\n          }\n        }\n\n        return { type, mutationName, args }\n      }\n\n      const mutation = nameFunction(\n        mutationName as string,\n        (...args: any[]) => {\n          const mock = module.$simplux.mutationMocks?.[mutationName as string]\n\n          if (mock) {\n            return mock(...args)\n          }\n\n          if (process.env.NODE_ENV !== 'production') {\n            if (currentlyDispatchingMutationName) {\n              throw new Error(\n                // tslint:disable-next-line: max-line-length\n                `mutation '${mutationName}' was attempted to be dispatched from within mutation '${currentlyDispatchingMutationName}' which is not allowed; instead use '${mutationName}.withState(...)' to call the mutation without a dispatch`,\n              )\n            }\n          }\n\n          currentlyDispatchingMutationName = mutationName as string\n          dispatch(createAction(...args))\n          currentlyDispatchingMutationName = undefined\n          return module.state()\n        },\n      ) as ResolvedMutation<TState, TMutations[typeof mutationName]>\n\n      acc[mutationName] = mutation\n\n      const extras = mutation as ShallowMutable<typeof mutation>\n\n      extras.withState = (state: TState, ...args: any[]) => {\n        return getReducer()(state, createAction(...args))\n      }\n\n      extras.asAction = createAction as any\n\n      extras.type = type\n\n      extras.mutationName = mutationName as string\n      extras.owningModule = module\n      extras[SIMPLUX_MUTATION] = '' as any\n\n      return acc\n    },\n    {} as ShallowMutable<SimpluxMutations<TState, TMutations>>,\n  )\n\n  return resolvedMutations\n\n  // this helper function allows creating a function with a dynamic name (only works with ES6+)\n  function nameFunction<T extends (...args: any[]) => any>(\n    name: string,\n    body: T,\n  ): T {\n    return {\n      [name](...args: any[]) {\n        return body(...args)\n      },\n    }[name] as T\n  }\n}\n\n// a very common use case for mutations in frontend applications is to\n// use them as event handlers for HTML elements like buttons; if the\n// mutation has no arguments and is passed directly as an event handler\n// (e.g. in React applications: onClick={myMutation}) it will get the\n// HTML event passed as an argument; we believe that in 99.99999% of\n// all cases where this happens we do not want that arg; therefore, we\n// filter any argument here that looks like an HTML event; if someone\n// needs an event as an arg, they can just wrap it in an object or\n// tuple as a workaround; we are not mentioning this in the docs, since\n// it is such an edge case and we can just tell people about the work-\n// around when they create a bug report\nfunction filterEventArgs(args: any[]) {\n  if (args.length === 0) {\n    return args\n  }\n\n  if (isEvent(args[0])) {\n    return args.slice(1)\n  }\n\n  return args\n}\n\ndeclare class Event {}\n\nfunction isEvent(arg: any) {\n  // tslint:disable-next-line: strict-type-predicates\n  if (typeof Event !== 'undefined' && arg instanceof Event) {\n    return true\n  }\n\n  if (arg === null || arg === undefined) {\n    return false\n  }\n\n  // check if it looks like an event\n  if (\n    hasProp(arg, 'target') &&\n    hasProp(arg, 'currentTarget') &&\n    hasProp(arg, 'defaultPrevented')\n  ) {\n    return true\n  }\n\n  return false\n\n  function hasProp(arg: any, name: string) {\n    return Object.prototype.hasOwnProperty.call(arg, name)\n  }\n}\n\n/**\n * Checks if an object is a simplux mutation.\n *\n * @param object - the object to check\n *\n * @returns true if the object is a simplux mutation\n *\n * @internal\n */\nexport function _isSimpluxMutation<TState, TArgs extends any[], TOther>(\n  object: SimpluxMutationMarker<TState, TArgs> | TOther,\n): object is SimpluxMutation<TState, TArgs> {\n  return (object as any)?.[SIMPLUX_MUTATION] === 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