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feat: improve typescript type assertion

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This commit is contained in:
Garfield Lee 2023-04-17 06:54:45 +00:00
parent 47fbe2df0a
commit 828051d3b2
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GPG key ID: EF60F5438ADC14D0
2 changed files with 70 additions and 28 deletions
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55
src/fs-helper.ts
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@ -1,5 +1,11 @@
import * as fs from 'fs'
function isErrorObject(
error: unknown
): error is {code?: string; message?: string} {
return typeof error === 'object' && error !== null
}
export function directoryExistsSync(path: string, required?: boolean): boolean {
if (!path) {
throw new Error("Arg 'path' must not be empty")
@ -9,17 +15,24 @@ export function directoryExistsSync(path: string, required?: boolean): boolean {
try {
stats = fs.statSync(path)
} catch (error) {
if ((error as any)?.code === 'ENOENT') {
if (!required) {
return false
if (isErrorObject(error)) {
if (error.code === 'ENOENT') {
if (!required) {
return false
}
throw new Error(`Directory '${path}' does not exist`)
}
throw new Error(`Directory '${path}' does not exist`)
if (error.message) {
throw new Error(
`Encountered an error when checking whether path '${path}' exists: ${error.message}`
)
}
}
throw new Error(
`Encountered an error when checking whether path '${path}' exists: ${(error as any)
?.message ?? error}`
`Encountered an error when checking whether path '${path}' exists: ${error}`
)
}
@ -40,13 +53,20 @@ export function existsSync(path: string): boolean {
try {
fs.statSync(path)
} catch (error) {
if ((error as any)?.code === 'ENOENT') {
return false
if (isErrorObject(error)) {
if (error.code === 'ENOENT') {
return false
}
if (error.message) {
throw new Error(
`Encountered an error when checking whether path '${path}' exists: ${error.message}`
)
}
}
throw new Error(
`Encountered an error when checking whether path '${path}' exists: ${(error as any)
?.message ?? error}`
`Encountered an error when checking whether path '${path}' exists: ${error}`
)
}
@ -62,13 +82,20 @@ export function fileExistsSync(path: string): boolean {
try {
stats = fs.statSync(path)
} catch (error) {
if ((error as any)?.code === 'ENOENT') {
return false
if (isErrorObject(error)) {
if (error.code === 'ENOENT') {
return false
}
if (error.message) {
throw new Error(
`Encountered an error when checking whether path '${path}' exists: ${error.message}`
)
}
}
throw new Error(
`Encountered an error when checking whether path '${path}' exists: ${(error as any)
?.message ?? error}`
`Encountered an error when checking whether path '${path}' exists: ${error}`
)
}