I'm just diving into Typescript and trying to implement it into one of my projects. However, I'm getting an error Cannot find name 'selectValue' when hovering over the selectValue method (See image below). Am I missing something in my tsconfig.json??
tsconfig.json:
{
"compilerOptions": {
/* Basic Options */
"target": "esnext", /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017','ES2018' or 'ESNEXT'. */
"module": "commonjs", /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */
"lib": ["es6"], /* Specify library files to be included in the compilation. */
"allowJs": true, /* Allow javascript files to be compiled. */
// "checkJs": true, /* Report errors in .js files. */
"jsx": "react-native", /* Specify JSX code generation: 'preserve', 'react-native', or 'react'. */
// "declaration": true, /* Generates corresponding '.d.ts' file. */
// "sourceMap": true, /* Generates corresponding '.map' file. */
// "outFile": "./", /* Concatenate and emit output to single file. */
// "outDir": "./", /* Redirect output structure to the directory. */
// "rootDir": "./", /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */
// "removeComments": true, /* Do not emit comments to output. */
"noEmit": true, /* Do not emit outputs. */
"incremental": true, /* Enable incremental compilation */
// "importHelpers": true, /* Import emit helpers from 'tslib'. */
// "downlevelIteration": true, /* Provide full support for iterables in 'for-of', spread, and destructuring when targeting 'ES5' or 'ES3'. */
"isolatedModules": true, /* Transpile each file as a separate module (similar to 'ts.transpileModule'). */
/* Strict Type-Checking Options */
"strict": true, /* Enable all strict type-checking options. */
// "noImplicitAny": true, /* Raise error on expressions and declarations with an implied 'any' type. */
// "strictNullChecks": true, /* Enable strict null checks. */
"strictFunctionTypes": true, /* Enable strict checking of function types. */
// "strictPropertyInitialization": true, /* Enable strict checking of property initialization in classes. */
// "noImplicitThis": true, /* Raise error on 'this' expressions with an implied 'any' type. */
// "alwaysStrict": true, /* Parse in strict mode and emit "use strict" for each source file. */
/* Additional Checks */
// "noUnusedLocals": true, /* Report errors on unused locals. */
// "noUnusedParameters": true, /* Report errors on unused parameters. */
// "noImplicitReturns": true, /* Report error when not all code paths in function return a value. */
// "noFallthroughCasesInSwitch": true, /* Report errors for fallthrough cases in switch statement. */
/* Module Resolution Options */
"moduleResolution": "node", /* Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6). */
"baseUrl": "./", /* Base directory to resolve non-absolute module names. */
// "paths": {}, /* A series of entries which re-map imports to lookup locations relative to the 'baseUrl'. */
// "rootDirs": [], /* List of root folders whose combined content represents the structure of the project at runtime. */
"typeRoots": [ /* List of folders to include type definitions from. */
],
"types": [ /* Type declaration files to be included in compilation. */
"react",
"react-native"
],
"allowSyntheticDefaultImports": true, /* Allow default imports from modules with no default export. This does not affect code emit, just typechecking. */
"esModuleInterop": true /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */
// "preserveSymlinks": true, /* Do not resolve the real path of symlinks. */
/* Source Map Options */
// "sourceRoot": "./", /* Specify the location where debugger should locate TypeScript files instead of source locations. */
// "mapRoot": "./", /* Specify the location where debugger should locate map files instead of generated locations. */
// "inlineSourceMap": true, /* Emit a single file with source maps instead of having a separate file. */
// "inlineSources": true, /* Emit the source alongside the sourcemaps within a single file; requires '--inlineSourceMap' or '--sourceMap' to be set. */
/* Experimental Options */
// "experimentalDecorators": true, /* Enables experimental support for ES7 decorators. */
// "emitDecoratorMetadata": true, /* Enables experimental support for emitting type metadata for decorators. */
},
"exclude": [
"node_modules",
"babel.config.js",
"metro.config.js",
"jest.config.js"
]
}
Component:
// Imports: Dependencies
import React, { useState } from 'react';
import { Dimensions, Platform, Picker, StyleSheet, Text, View, TouchableOpacity } from 'react-native';
// import DateTimePicker from '@react-native-community/datetimepicker';
import Modal from 'react-native-modal';
import Icon from 'react-native-vector-icons/Ionicons';
Icon.loadFont();
// Screen Dimensions
const { height, width } = Dimensions.get('window');
// Component: List Picker
export const ListPicker = (props: object) => {
// React Hooks: State
const [ modalVisible, toggle ] = useState(false);
const [ value, setValue ] = useState();
// React Hooks: Lifecycle Methods
// Toggle Modal
toggleModal = () => {
try {
// Check Platform (iOS)
if (Platform.OS === 'ios') {
// React Hook: Toggle Modal
toggle((modalVisible) => !modalVisible);
}
// Check Platform (Android)
if (Platform.OS === 'android') {
};
}
catch (error) {
console.log(error);
}
};
// Select Value
selectValue = (value: string) => {
try {
// React Hook: Set Value
setValue(value);
// React Props: onValueChange
props.onValueChange(value);
}
catch (error) {
console.log(error);
}
};
// Render Picker
renderPicker = () => {
try {
return (
<Picker
selectedValue={value}
onValueChange={this.selectValue}>
{props.items.map((item: object) => {
return (
<Picker.Item
label={item.label}
value={item.value}
key={item.key || item.label}
color={item.color}
/>
);
})}
</Picker>
)
}
catch (error) {
console.log(error);
}
};
return (
<View style={styles.container}>
<View style={styles.inputTitleContainer}>
<Text style={styles.inputTitle}>{props.title}</Text>
</View>
<TouchableOpacity onPress={this.toggleModal} style={styles.fieldTextContainer}>
<Text style={styles.fieldText} numberOfLines={1}>{value !== undefined ? value : 'Select'}</Text>
<Icon name="ios-arrow-forward" size={22} style={styles.arrowForward}/>
</TouchableOpacity>
<Modal isVisible={modalVisible} style={styles.modal}>
<View style={styles.modalContainer}>
<View style={styles.pickerHeaderContainer}>
<TouchableOpacity onPress={this.toggleModal} >
<Text style={styles.doneText}>Done</Text>
</TouchableOpacity>
</View>
<View style={styles.pickerContainer}>
{this.renderPicker()}
</View>
</View>
</Modal>
</View>
);
}
// Styles
const styles = StyleSheet.create({
container: {
display: 'flex',
width: width - 32,
marginLeft: 16,
marginRight: 16,
justifyContent: 'center',
},
modal: {
margin: 0,
},
modalContainer: {
height: '100%',
alignItems: 'center',
justifyContent: 'flex-end',
},
pickerHeaderContainer: {
display: 'flex',
flexDirection: 'row',
justifyContent: 'flex-end',
alignItems: 'center',
height: 40,
width: width,
backgroundColor: '#FAFAF8',
borderColor: '#7D7D7D',
borderBottomWidth: StyleSheet.hairlineWidth,
},
pickerContainer: {
height: 220,
width: width,
// backgroundColor: '#CFD3D9',
backgroundColor: 'white',
},
doneText: {
fontFamily: 'System',
color: '#007AFF',
fontWeight: '600',
fontSize: 17,
marginRight: 16,
},
stateContainer: {
alignItems: 'center',
width: 75,
borderColor: '#7D7D7D',
borderBottomWidth: StyleSheet.hairlineWidth,
},
inputTitleContainer: {
width: 75,
marginBottom: 4,
},
inputTitle: {
color: '#7D7D7D',
borderColor: '#7D7D7D',
fontSize: 10,
fontWeight: '600',
textTransform: 'uppercase',
},
fieldTextContainer: {
height: 40,
display: 'flex',
flexDirection: 'row',
justifyContent: 'space-between',
alignItems: 'center',
marginBottom: 4,
borderColor: '#7D7D7D',
borderBottomWidth: StyleSheet.hairlineWidth,
},
fieldText: {
width: width - 32 - 20,
fontFamily: 'System',
fontSize: 17,
fontWeight: '400',
color: '#000000',
alignSelf: 'center',
},
arrowForward: {
color: 'black',
opacity: .3,
marginRight: 7,
},
});
Screenshot:
