ts-pattern/dist/index.js

The exhaustive Pattern Matching library for TypeScript.

const t=Symbol.for("@ts-pattern/matcher"),e=Symbol.for("@ts-pattern/isVariadic"),n="@ts-pattern/anonymous-select-key",r=t=>Boolean(t&&"object"==typeof t),i=e=>e&&!!e[t],o=(n,s,c)=>{if(i(n)){const e=n[t](),{matched:r,selections:i}=e.match(s);return r&&i&&Object.keys(i).forEach(t=>c(t,i[t])),r}if(r(n)){if(!r(s))return!1;if(Array.isArray(n)){if(!Array.isArray(s))return!1;let t=[],r=[],a=[];for(const o of n.keys()){const s=n[o];i(s)&&s[e]?a.push(s):a.length?r.push(s):t.push(s)}if(a.length){if(a.length>1)throw new Error("Pattern error: Using `...P.array(...)` several times in a single pattern is not allowed.");if(s.length<t.length+r.length)return!1;const e=s.slice(0,t.length),n=0===r.length?[]:s.slice(-r.length),i=s.slice(t.length,0===r.length?Infinity:-r.length);return t.every((t,n)=>o(t,e[n],c))&&r.every((t,e)=>o(t,n[e],c))&&(0===a.length||o(a[0],i,c))}return n.length===s.length&&n.every((t,e)=>o(t,s[e],c))}return Reflect.ownKeys(n).every(e=>{const r=n[e];return(e in s||i(a=r)&&"optional"===a[t]().matcherType)&&o(r,s[e],c);var a})}return Object.is(s,n)},s=e=>{var n,o,a;return r(e)?i(e)?null!=(n=null==(o=(a=e[t]()).getSelectionKeys)?void 0:o.call(a))?n:[]:Array.isArray(e)?c(e,s):c(Object.values(e),s):[]},c=(t,e)=>t.reduce((t,n)=>t.concat(e(n)),[]);function a(...t){if(1===t.length){const[e]=t;return t=>o(e,t,()=>{})}if(2===t.length){const[e,n]=t;return o(e,n,()=>{})}throw new Error(`isMatching wasn't given the right number of arguments: expected 1 or 2, received ${t.length}.`)}function u(t){return Object.assign(t,{optional:()=>h(t),and:e=>m(t,e),or:e=>d(t,e),select:e=>void 0===e?y(t):y(e,t)})}function l(t){return Object.assign((t=>Object.assign(t,{[Symbol.iterator](){let n=0;const r=[{value:Object.assign(t,{[e]:!0}),done:!1},{done:!0,value:void 0}];return{next:()=>{var t;return null!=(t=r[n++])?t:r.at(-1)}}}}))(t),{optional:()=>l(h(t)),select:e=>l(void 0===e?y(t):y(e,t))})}function h(e){return u({[t]:()=>({match:t=>{let n={};const r=(t,e)=>{n[t]=e};return void 0===t?(s(e).forEach(t=>r(t,void 0)),{matched:!0,selections:n}):{matched:o(e,t,r),selections:n}},getSelectionKeys:()=>s(e),matcherType:"optional"})})}const f=(t,e)=>{for(const n of t)if(!e(n))return!1;return!0},g=(t,e)=>{for(const[n,r]of t.entries())if(!e(r,n))return!1;return!0};function m(...e){return u({[t]:()=>({match:t=>{let n={};const r=(t,e)=>{n[t]=e};return{matched:e.every(e=>o(e,t,r)),selections:n}},getSelectionKeys:()=>c(e,s),matcherType:"and"})})}function d(...e){return u({[t]:()=>({match:t=>{let n={};const r=(t,e)=>{n[t]=e};return c(e,s).forEach(t=>r(t,void 0)),{matched:e.some(e=>o(e,t,r)),selections:n}},getSelectionKeys:()=>c(e,s),matcherType:"or"})})}function p(e){return{[t]:()=>({match:t=>({matched:Boolean(e(t))})})}}function y(...e){const r="string"==typeof e[0]?e[0]:void 0,i=2===e.length?e[1]:"string"==typeof e[0]?void 0:e[0];return u({[t]:()=>({match:t=>{let e={[null!=r?r:n]:t};return{matched:void 0===i||o(i,t,(t,n)=>{e[t]=n}),selections:e}},getSelectionKeys:()=>[null!=r?r:n].concat(void 0===i?[]:s(i))})})}function v(t){return"number"==typeof t}function b(t){return"string"==typeof t}function w(t){return"bigint"==typeof t}const S=u(p(function(t){return!0})),O=S,j=t=>Object.assign(u(t),{startsWith:e=>{return j(m(t,(n=e,p(t=>b(t)&&t.startsWith(n)))));var n},endsWith:e=>{return j(m(t,(n=e,p(t=>b(t)&&t.endsWith(n)))));var n},minLength:e=>j(m(t,(t=>p(e=>b(e)&&e.length>=t))(e))),length:e=>j(m(t,(t=>p(e=>b(e)&&e.length===t))(e))),maxLength:e=>j(m(t,(t=>p(e=>b(e)&&e.length<=t))(e))),includes:e=>{return j(m(t,(n=e,p(t=>b(t)&&t.includes(n)))));var n},regex:e=>{return j(m(t,(n=e,p(t=>b(t)&&Boolean(t.match(n))))));var n}}),K=j(p(b)),x=t=>Object.assign(u(t),{between:(e,n)=>x(m(t,((t,e)=>p(n=>v(n)&&t<=n&&e>=n))(e,n))),lt:e=>x(m(t,(t=>p(e=>v(e)&&e<t))(e))),gt:e=>x(m(t,(t=>p(e=>v(e)&&e>t))(e))),lte:e=>x(m(t,(t=>p(e=>v(e)&&e<=t))(e))),gte:e=>x(m(t,(t=>p(e=>v(e)&&e>=t))(e))),int:()=>x(m(t,p(t=>v(t)&&Number.isInteger(t)))),finite:()=>x(m(t,p(t=>v(t)&&Number.isFinite(t)))),positive:()=>x(m(t,p(t=>v(t)&&t>0))),negative:()=>x(m(t,p(t=>v(t)&&t<0)))}),E=x(p(v)),A=t=>Object.assign(u(t),{between:(e,n)=>A(m(t,((t,e)=>p(n=>w(n)&&t<=n&&e>=n))(e,n))),lt:e=>A(m(t,(t=>p(e=>w(e)&&e<t))(e))),gt:e=>A(m(t,(t=>p(e=>w(e)&&e>t))(e))),lte:e=>A(m(t,(t=>p(e=>w(e)&&e<=t))(e))),gte:e=>A(m(t,(t=>p(e=>w(e)&&e>=t))(e))),positive:()=>A(m(t,p(t=>w(t)&&t>0))),negative:()=>A(m(t,p(t=>w(t)&&t<0)))}),P=A(p(w)),T=u(p(function(t){return"boolean"==typeof t})),B=u(p(function(t){return"symbol"==typeof t})),_=u(p(function(t){return null==t})),k=u(p(function(t){return null!=t}));var N={__proto__:null,matcher:t,optional:h,array:function(...e){return l({[t]:()=>({match:t=>{if(!Array.isArray(t))return{matched:!1};if(0===e.length)return{matched:!0};const n=e[0];let r={};if(0===t.length)return s(n).forEach(t=>{r[t]=[]}),{matched:!0,selections:r};const i=(t,e)=>{r[t]=(r[t]||[]).concat([e])};return{matched:t.every(t=>o(n,t,i)),selections:r}},getSelectionKeys:()=>0===e.length?[]:s(e[0])})})},set:function(...e){return u({[t]:()=>({match:t=>{if(!(t instanceof Set))return{matched:!1};let n={};if(0===t.size)return{matched:!0,selections:n};if(0===e.length)return{matched:!0};const r=(t,e)=>{n[t]=(n[t]||[]).concat([e])},i=e[0];return{matched:f(t,t=>o(i,t,r)),selections:n}},getSelectionKeys:()=>0===e.length?[]:s(e[0])})})},map:function(...e){return u({[t]:()=>({match:t=>{if(!(t instanceof Map))return{matched:!1};let n={};if(0===t.size)return{matched:!0,selections:n};const r=(t,e)=>{n[t]=(n[t]||[]).concat([e])};if(0===e.length)return{matched:!0};var i;if(1===e.length)throw new Error(`\`P.map\` wasn't given enough arguments. Expected (key, value), received ${null==(i=e[0])?void 0:i.toString()}`);const[s,c]=e;return{matched:g(t,(t,e)=>{const n=o(s,e,r),i=o(c,t,r);return n&&i}),selections:n}},getSelectionKeys:()=>0===e.length?[]:[...s(e[0]),...s(e[1])]})})},intersection:m,union:d,not:function(e){return u({[t]:()=>({match:t=>({matched:!o(e,t,()=>{})}),getSelectionKeys:()=>[],matcherType:"not"})})},when:p,select:y,any:S,_:O,string:K,number:E,bigint:P,boolean:T,symbol:B,nullish:_,nonNullable:k,instanceOf:function(t){return u(p(function(t){return e=>e instanceof t}(t)))},shape:function(t){return u(p(a(t)))}};class W extends Error{constructor(t){let e;try{e=JSON.stringify(t)}catch(n){e=t}super(`Pattern matching error: no pattern matches value ${e}`),this.input=void 0,this.input=t}}const $={matched:!1,value:void 0};function z(t){return new I(t,$)}class I{constructor(t,e){this.input=void 0,this.state=void 0,this.input=t,this.state=e}with(...t){if(this.state.matched)return this;const e=t[t.length-1],r=[t[0]];let i;3===t.length&&"function"==typeof t[1]?i=t[1]:t.length>2&&r.push(...t.slice(1,t.length-1));let s=!1,c={};const a=(t,e)=>{s=!0,c[t]=e},u=!r.some(t=>o(t,this.input,a))||i&&!Boolean(i(this.input))?$:{matched:!0,value:e(s?n in c?c[n]:c:this.input,this.input)};return new I(this.input,u)}when(t,e){if(this.state.matched)return this;const n=Boolean(t(this.input));return new I(this.input,n?{matched:!0,value:e(this.input,this.input)}:$)}otherwise(t){return this.state.matched?this.state.value:t(this.input)}exhaustive(t=L){return this.state.matched?this.state.value:t(this.input)}run(){return this.exhaustive()}returnType(){return this}}function L(t){throw new W(t)}export{W as NonExhaustiveError,N as P,N as Pattern,a as isMatching,z as match};
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