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generateCodeSnippets.ts
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generateCodeSnippets.ts
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import type { NormalizedOutputOptions } from '../rollup/types';
import RESERVED_NAMES from './RESERVED_NAMES';
import { isValidIdentifier } from './isValidIdentifier';
export interface GenerateCodeSnippets {
_: string;
cnst: string;
n: string;
s: string;
getDirectReturnFunction(
parameters: string[],
options: {
functionReturn: boolean;
lineBreakIndent: { base: string; t: string } | null;
name: string | null;
}
): [left: string, right: string];
getDirectReturnIifeLeft(
parameters: string[],
returned: string,
options: {
needsArrowReturnParens: boolean | undefined;
needsWrappedFunction: boolean | undefined;
}
): string;
getFunctionIntro(
parameters: string[],
options: { isAsync: boolean; name: string | null }
): string;
getNonArrowFunctionIntro(
parameters: string[],
options: { isAsync: boolean; name: string | null }
): string;
getObject(
fields: [key: string | null, value: string][],
options: { lineBreakIndent: { base: string; t: string } | null }
): string;
getPropertyAccess(name: string): string;
}
export function getGenerateCodeSnippets({
compact,
generatedCode: { arrowFunctions, constBindings, objectShorthand, reservedNamesAsProps }
}: NormalizedOutputOptions): GenerateCodeSnippets {
const { _, n, s } = compact ? { _: '', n: '', s: '' } : { _: ' ', n: '\n', s: ';' };
const cnst = constBindings ? 'const' : 'var';
const getNonArrowFunctionIntro: GenerateCodeSnippets['getNonArrowFunctionIntro'] = (
parameters,
{ isAsync, name }
) =>
`${isAsync ? `async ` : ''}function${name ? ` ${name}` : ''}${_}(${parameters.join(
`,${_}`
)})${_}`;
const getFunctionIntro: GenerateCodeSnippets['getFunctionIntro'] = arrowFunctions
? (parameters, { isAsync, name }) => {
const singleParameter = parameters.length === 1;
const asyncString = isAsync ? `async${singleParameter ? ' ' : _}` : '';
return `${name ? `${cnst} ${name}${_}=${_}` : ''}${asyncString}${
singleParameter ? parameters[0] : `(${parameters.join(`,${_}`)})`
}${_}=>${_}`;
}
: getNonArrowFunctionIntro;
const getDirectReturnFunction: GenerateCodeSnippets['getDirectReturnFunction'] = (
parameters,
{ functionReturn, lineBreakIndent, name }
) => [
`${getFunctionIntro(parameters, {
isAsync: false,
name
})}${
arrowFunctions
? lineBreakIndent
? `${n}${lineBreakIndent.base}${lineBreakIndent.t}`
: ''
: `{${lineBreakIndent ? `${n}${lineBreakIndent.base}${lineBreakIndent.t}` : _}${
functionReturn ? 'return ' : ''
}`
}`,
arrowFunctions
? `${name ? ';' : ''}${lineBreakIndent ? `${n}${lineBreakIndent.base}` : ''}`
: `${s}${lineBreakIndent ? `${n}${lineBreakIndent.base}` : _}}`
];
const isValidPropertyName = reservedNamesAsProps
? isValidIdentifier
: (name: string): boolean => !RESERVED_NAMES.has(name) && isValidIdentifier(name);
return {
_,
cnst,
getDirectReturnFunction,
getDirectReturnIifeLeft: (
parameters,
returned,
{ needsArrowReturnParens, needsWrappedFunction }
) => {
const [left, right] = getDirectReturnFunction(parameters, {
functionReturn: true,
lineBreakIndent: null,
name: null
});
return `${wrapIfNeeded(
`${left}${wrapIfNeeded(returned, arrowFunctions && needsArrowReturnParens)}${right}`,
arrowFunctions || needsWrappedFunction
)}(`;
},
getFunctionIntro,
getNonArrowFunctionIntro,
getObject(fields, { lineBreakIndent }) {
const prefix = lineBreakIndent ? `${n}${lineBreakIndent.base}${lineBreakIndent.t}` : _;
return `{${fields
.map(([key, value]) => {
if (key === null) return `${prefix}${value}`;
const needsQuotes = !isValidPropertyName(key);
return key === value && objectShorthand && !needsQuotes
? prefix + key
: `${prefix}${needsQuotes ? `'${key}'` : key}:${_}${value}`;
})
.join(`,`)}${
fields.length === 0 ? '' : lineBreakIndent ? `${n}${lineBreakIndent.base}` : _
}}`;
},
getPropertyAccess: (name: string): string =>
isValidPropertyName(name) ? `.${name}` : `[${JSON.stringify(name)}]`,
n,
s
};
}
const wrapIfNeeded = (code: string, needsParens: boolean | undefined): string =>
needsParens ? `(${code})` : code;