chore: generate image IDs from relative filepath (#605)

Co-authored-by: Ben McCann <[email protected]>

.changeset/tender-jobs-double.md

@@ -0,0 +1,5 @@
+---
+'imagetools-core': patch
+---
+
+chore: image IDs are now generated from relative filepaths instead of absolute ones

packages/core/src/util.ts

@@ -1,4 +1,5 @@
 import { createHash } from 'node:crypto'
+import path from 'node:path'
 import sharp from 'sharp'
 import { ImageConfig } from './types.js'
 
@@ -7,7 +8,11 @@ export function loadImage(path: string) {
 }
 
 export function generateImageID(url: URL, config: ImageConfig) {
- const baseURL = url.host ? new URL(url.origin + url.pathname) : new URL(url.protocol + url.pathname)
+ // this isn't a valid URL, but just a string used for an identifier
+ // use a relative path in the local case so that it's consistent across machines
+ const baseURL = url.host
+ ? new URL(url.origin + url.pathname)
+ : new URL(url.protocol + path.relative(process.cwd(), url.pathname))
 
  return createHash('sha1').update(baseURL.href).update(JSON.stringify(config)).digest('hex')
 }