An experimental TypeSpec syntax for Lexicon
wip
+27
+27
packages/emitter/src/emitter.ts
+27
packages/emitter/src/emitter.ts
···
1227
1227
1228
1228
// Otherwise, emit as union of refs
1229
1229
if (unionRefs.length > 0) {
1230
+
// Check for unsupported mixed pattern: model refs + string literals
1231
+
if (stringLiterals.length > 0) {
1232
+
this.program.reportDiagnostic({
1233
+
code: "union-mixed-refs-literals",
1234
+
severity: "error",
1235
+
message:
1236
+
`Union contains both model references and string literals. Atproto unions must be either: ` +
1237
+
`(1) model references only (type: "union"), or ` +
1238
+
`(2) string literals + string type (type: "string" with knownValues). ` +
1239
+
`Separate these into distinct fields or nested unions.`,
1240
+
target: unionType,
1241
+
});
1242
+
return null;
1243
+
}
1244
+
1230
1245
const unionDef: LexiconUnion = {
1231
1246
type: "union",
1232
1247
refs: unionRefs,
···
1256
1271
}
1257
1272
return unionDef;
1258
1273
}
1274
+
1275
+
// No refs and no string literals - empty or unsupported union
1276
+
if (stringLiterals.length === 0 && !hasUnknown) {
1277
+
this.program.reportDiagnostic({
1278
+
code: "union-empty",
1279
+
severity: "error",
1280
+
message:
1281
+
`Union has no variants. Atproto unions must contain either model references or string literals.`,
1282
+
target: unionType,
1283
+
});
1284
+
}
1285
+
1259
1286
return null;
1260
1287
case "Intrinsic":
1261
1288
// Handle unknown type - return unknown definition