refun/web/map-state.js.map

A collection of React Hook-enabled functions that compose harmoniously with each other. Similar to `recompose`, but:

{"version":3,"sources":["map-state.ts"],"names":["useState","useRef","EMPTY_OBJECT","shallowEqualByKeys","mapState","stateName","stateSetterName","getValue","watchKeys","props","prevProps","current","state","setState","nextState"],"mappings":";;AAAA,SAASA,QAAT,EAAmBC,MAAnB,QAAiC,OAAjC;AACA,SAASC,YAAT,QAA6B,MAA7B;AAEA,SAASC,kBAAT,QAAmC,SAAnC;AAEA,OAAO,IAAMC,QAAQ,GAAG,SAAXA,QAAW,CAA0DC,SAA1D,EAAyEC,eAAzE,EAA+FC,QAA/F,EAA0HC,SAA1H;AAAA,SACtB,UAACC,KAAD,EAA+E;AAAA;;AAC7E,QAAMC,SAAS,GAAGT,MAAM,CAAIC,YAAJ,CAAxB;;AAD6E,oBAEnDF,QAAQ,CAAIU,SAAS,CAACC,OAAV,KAAsBT,YAAtB,GAAqCK,QAAQ,CAACE,KAAD,CAA7C,GAAuDP,YAA3D,CAF2C;AAAA;AAAA,QAEtEU,KAFsE;AAAA,QAE/DC,QAF+D;;AAI7E,QAAIC,SAAS,GAAGF,KAAhB;;AAEA,QAAIF,SAAS,CAACC,OAAV,KAAsBT,YAAtB,IAAsC,CAACC,kBAAkB,CAACO,SAAS,CAACC,OAAX,EAAoBF,KAApB,EAA2BD,SAA3B,CAA7D,EAAoG;AAClG;AACA;AACA;AACAM,MAAAA,SAAS,GAAGP,QAAQ,CAACE,KAAD,CAApB,CAJkG,CAMlG;AACA;AACA;AACA;AACA;;AACA,UAAIK,SAAS,KAAKF,KAAlB,EAAyB;AACvBC,QAAAA,QAAQ,CAACC,SAAD,CAAR;AACD;AACF;;AAEDJ,IAAAA,SAAS,CAACC,OAAV,GAAoBF,KAApB;AAEA,6BACKA,KADL,wDAEGJ,SAFH,EAEeS,SAFf,mCAGGR,eAHH,EAGqBO,QAHrB;AAMD,GA/BqB;AAAA,CAAjB","sourcesContent":["import { useState, useRef } from 'react'\nimport { EMPTY_OBJECT } from 'tsfn'\nimport type { TExtend3 } from 'tsfn'\nimport { shallowEqualByKeys } from './utils'\n\nexport const mapState = <SN extends string, SSN extends string, P extends {}, R> (stateName: SN, stateSetterName: SSN, getValue: (props: P) => R, watchKeys: (keyof P)[]) =>\n  (props: P): TExtend3<P, { [K in SN]: R }, { [K in SSN]: (arg: R) => void }> => {\n    const prevProps = useRef<P>(EMPTY_OBJECT)\n    const [state, setState] = useState<R>(prevProps.current === EMPTY_OBJECT ? getValue(props) : EMPTY_OBJECT)\n\n    let nextState = state\n\n    if (prevProps.current !== EMPTY_OBJECT && !shallowEqualByKeys(prevProps.current, props, watchKeys)) {\n      // React will continue current render, delivering 'state', which is already old state.\n      // By assigning to 'nextState', we deliver fresh state during current render.\n      // After that React will rerender due to actual 'setState', delivering same state value.\n      nextState = getValue(props)\n\n      // React prevents rerender by setState if next value is the same as current state.\n      // But in this case, setState is triggered during the render phase.\n      // React does not interrupt render, and lets the component to render till the end,\n      // and after that initiates next render caused by this setState.\n      // Manually checking for equality to prevent unnecessary rerender.\n      if (nextState !== state) {\n        setState(nextState)\n      }\n    }\n\n    prevProps.current = props\n\n    return {\n      ...props,\n      [stateName]: nextState,\n      [stateSetterName]: setState,\n      // FIXME: https://github.com/Microsoft/TypeScript/issues/13948\n    } as any\n  }\n"],"file":"map-state.js"}