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{  "importMapBaseURL": "https://example.com/app/index.html",  "baseURL": "https://example.com/js/app.mjs",  "name": "Entries with errors shouldn't allow fallback",  "tests": {    "No fallback to less-specific prefixes": {      "importMap": {        "imports": {          "null/": "/1/",          "null/b/": null,          "null/b/c/": "/1/2/",          "invalid-url/": "/1/",          "invalid-url/b/": "https://:invalid-url:/",          "invalid-url/b/c/": "/1/2/",          "without-trailing-slashes/": "/1/",          "without-trailing-slashes/b/": "/x",          "without-trailing-slashes/b/c/": "/1/2/",          "prefix-resolution-error/": "/1/",          "prefix-resolution-error/b/": "data:text/javascript,/",          "prefix-resolution-error/b/c/": "/1/2/"        }      },      "expectedResults": {        "null/x": "https://example.com/1/x",        "null/b/x": null,        "null/b/c/x": "https://example.com/1/2/x",        "invalid-url/x": "https://example.com/1/x",        "invalid-url/b/x": null,        "invalid-url/b/c/x": "https://example.com/1/2/x",        "without-trailing-slashes/x": "https://example.com/1/x",        "without-trailing-slashes/b/x": null,        "without-trailing-slashes/b/c/x": "https://example.com/1/2/x",        "prefix-resolution-error/x": "https://example.com/1/x",        "prefix-resolution-error/b/x": null,        "prefix-resolution-error/b/c/x": "https://example.com/1/2/x"      }    },    "No fallback to less-specific scopes": {      "importMap": {        "imports": {          "null": "https://example.com/a",          "invalid-url": "https://example.com/b",          "without-trailing-slashes/": "https://example.com/c/",          "prefix-resolution-error/": "https://example.com/d/"        },        "scopes": {          "/js/": {            "null": null,            "invalid-url": "https://:invalid-url:/",            "without-trailing-slashes/": "/x",            "prefix-resolution-error/": "data:text/javascript,/"          }        }      },      "expectedResults": {        "null": null,        "invalid-url": null,        "without-trailing-slashes/x": null,        "prefix-resolution-error/x": null      }    },    "No fallback to absolute URL parsing": {      "importMap": {        "imports": {},        "scopes": {          "/js/": {            "https://example.com/null": null,            "https://example.com/invalid-url": "https://:invalid-url:/",            "https://example.com/without-trailing-slashes/": "/x",            "https://example.com/prefix-resolution-error/": "data:text/javascript,/"          }        }      },      "expectedResults": {        "https://example.com/null": null,        "https://example.com/invalid-url": null,        "https://example.com/without-trailing-slashes/x": null,        "https://example.com/prefix-resolution-error/x": null      }    }  }}