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select an item #1 
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‎jest.config.js‎

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/** @type {import('@ts-jest/dist/types').InitialOptionsTsJest} */
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module.exports = {
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preset: 'ts-jest',
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testEnvironment: 'node',
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};

‎package.json‎

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{
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"name": "macos-multi-select",
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"version": "0.0.1",
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"description": "Given a list of ids, and an action, return a list of selected items with the same behaviour of macOS finder list view selection.",
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"main": "dist/index.js",
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"repository": "[email protected]:codingedgar/macos-multi-select.git",
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"author": "codingedgar <[email protected]>",
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"license": "MIT",
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"scripts": {
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"test": "jest",
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"test-watch": "jest --watch",
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"build": "rm -r dist && tsc"
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},
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"bugs": {
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"url": "https://github.com/davidkpiano/xstate/issues"
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},
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"devDependencies": {
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"@types/jest": "^27.0.0",
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"fast-check": "^2.17.0",
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"jest": "^27.0.6",
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"ts-jest": "^27.0.4",
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"typescript": "^4.3.5"
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},
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"dependencies": {
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"fp-ts": "^2.11.1"
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}
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}

‎src/index.ts‎

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type Context = {
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list: string[],
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selected: string[],
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}
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type Command =
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| {type: "SINGLE SELECT", id: string}
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export function multiselect(context: Context, command: Command): Context {
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if (command.type === 'SINGLE SELECT' && context.list.includes(command.id)) {
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return {
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...context,
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selected: [command.id]
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};
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} else {
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return context;
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}
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}

‎src/spec/selectAnItem.spec.ts‎

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import fc from 'fast-check';
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import {multiselect} from '../index';
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describe('Select an Item', () => {
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test('should be able to select one item in a non empty list', () => {
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fc.assert(
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fc.property(
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fc.set(
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fc.string()
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)
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.filter(list => list.length > 0)
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.chain(list =>
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fc.record({
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list: fc.constant(list),
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id: fc.integer(0, list.length-1)
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.map(index => list[index]),
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})
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),
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({
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list,
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id,
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}) => {
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expect(
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multiselect({
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list,
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selected: [],
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},
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{
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type: 'SINGLE SELECT',
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id,
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}
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)
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)
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.toEqual({
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list,
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selected: [id]
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})
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}
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)
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)
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});
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test('if another single select if performed, the previous is deselected', () => {
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fc.assert(
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fc.property(
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fc.set(
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fc.string()
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)
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.filter(list => list.length > 1)
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.chain(list =>
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fc.record({
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list: fc.constant(list),
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selectedId: fc.integer(0, list.length-1)
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.map(index => list[index]),
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id: fc.integer(0, list.length-1)
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.map(index => list[index]),
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})
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.filter(context => context.selectedId !== context.id)
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),
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({
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list,
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selectedId,
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id,
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}) => {
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expect(
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multiselect({
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list,
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selected: [selectedId],
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},
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{
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type: 'SINGLE SELECT',
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id,
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}
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)
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)
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.toEqual({
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list,
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selected: [id]
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})
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}
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)
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)
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});
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})

‎tsconfig.json‎

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{
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"compilerOptions": {
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/* Visit https://aka.ms/tsconfig.json to read more about this file */
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/* Basic Options */
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// "incremental": true, /* Enable incremental compilation */
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"target": "es5",
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/* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019', 'ES2020', or 'ESNEXT'. */
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"module": "commonjs",
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/* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', 'es2020', or 'ESNext'. */
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// "lib": [], /* Specify library files to be included in the compilation. */
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// "allowJs": true, /* Allow javascript files to be compiled. */
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// "checkJs": true, /* Report errors in .js files. */
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// "jsx": "preserve", /* Specify JSX code generation: 'preserve', 'react-native', or 'react'. */
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"declaration": true,
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/* Generates corresponding '.d.ts' file. */
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// "declarationMap": true, /* Generates a sourcemap for each corresponding '.d.ts' file. */
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"sourceMap": true,
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/* Generates corresponding '.map' file. */
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// "outFile": "./", /* Concatenate and emit output to single file. */
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"outDir": "./dist",
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/* Redirect output structure to the directory. */
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// "rootDir": "./", /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */
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// "composite": true, /* Enable project compilation */
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// "tsBuildInfoFile": "./", /* Specify file to store incremental compilation information */
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// "removeComments": true, /* Do not emit comments to output. */
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// "noEmit": true, /* Do not emit outputs. */
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// "importHelpers": true, /* Import emit helpers from 'tslib'. */
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// "downlevelIteration": true, /* Provide full support for iterables in 'for-of', spread, and destructuring when targeting 'ES5' or 'ES3'. */
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// "isolatedModules": true, /* Transpile each file as a separate module (similar to 'ts.transpileModule'). */
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/* Strict Type-Checking Options */
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"strict": true,
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/* Enable all strict type-checking options. */
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// "noImplicitAny": true, /* Raise error on expressions and declarations with an implied 'any' type. */
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// "strictNullChecks": true, /* Enable strict null checks. */
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// "strictFunctionTypes": true, /* Enable strict checking of function types. */
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// "strictBindCallApply": true, /* Enable strict 'bind', 'call', and 'apply' methods on functions. */
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// "strictPropertyInitialization": true, /* Enable strict checking of property initialization in classes. */
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// "noImplicitThis": true, /* Raise error on 'this' expressions with an implied 'any' type. */
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// "alwaysStrict": true, /* Parse in strict mode and emit "use strict" for each source file. */
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/* Additional Checks */
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// "noUnusedLocals": true, /* Report errors on unused locals. */
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// "noUnusedParameters": true, /* Report errors on unused parameters. */
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// "noImplicitReturns": true, /* Report error when not all code paths in function return a value. */
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// "noFallthroughCasesInSwitch": true, /* Report errors for fallthrough cases in switch statement. */
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// "noUncheckedIndexedAccess": true, /* Include 'undefined' in index signature results */
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/* Module Resolution Options */
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// "moduleResolution": "node", /* Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6). */
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// "baseUrl": "./", /* Base directory to resolve non-absolute module names. */
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// "paths": {}, /* A series of entries which re-map imports to lookup locations relative to the 'baseUrl'. */
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// "rootDirs": [], /* List of root folders whose combined content represents the structure of the project at runtime. */
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// "typeRoots": [], /* List of folders to include type definitions from. */
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// "types": [], /* Type declaration files to be included in compilation. */
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// "allowSyntheticDefaultImports": true, /* Allow default imports from modules with no default export. This does not affect code emit, just typechecking. */
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"esModuleInterop": true,
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/* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */
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// "preserveSymlinks": true, /* Do not resolve the real path of symlinks. */
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// "allowUmdGlobalAccess": true, /* Allow accessing UMD globals from modules. */
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/* Source Map Options */
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// "sourceRoot": "", /* Specify the location where debugger should locate TypeScript files instead of source locations. */
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// "mapRoot": "", /* Specify the location where debugger should locate map files instead of generated locations. */
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// "inlineSourceMap": true, /* Emit a single file with source maps instead of having a separate file. */
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// "inlineSources": true, /* Emit the source alongside the sourcemaps within a single file; requires '--inlineSourceMap' or '--sourceMap' to be set. */
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/* Experimental Options */
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// "experimentalDecorators": true, /* Enables experimental support for ES7 decorators. */
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// "emitDecoratorMetadata": true, /* Enables experimental support for emitting type metadata for decorators. */
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/* Advanced Options */
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"skipLibCheck": true,
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/* Skip type checking of declaration files. */
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"forceConsistentCasingInFileNames": true /* Disallow inconsistently-cased references to the same file. */
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},
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"include": [
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"src"
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],
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"exclude": [
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"src/**/*.spec.ts"
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]
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}

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