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Fix #221: improve diagnostics when dereference fails #222

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merged 2 commits into from
Sep 13, 2018
Merged

Fix #221: improve diagnostics when dereference fails #222

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fc805f9
Fix #221: improve diagnostics when dereference fails
Sep 12, 2018
df1435f
If deref fails, do not emit further errors
Sep 12, 2018
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59 changes: 31 additions & 28 deletions packages/jsii/lib/assembler.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -162,14 +162,21 @@ export class Assembler implements Emitter {
*
* @returns the de-referenced type, if it was found, otherwise ``undefined``.
*/
private _dereference(ref: spec.NamedTypeReference): spec.Type | undefined {
private _dereference(ref: spec.NamedTypeReference, referencingNode: ts.Node): spec.Type | undefined {
const [assm, ] = ref.fqn.split('.');
let type;
if (assm === this.projectInfo.name) {
return this._types[ref.fqn];
type = this._types[ref.fqn];
} else {
const assembly = this.projectInfo.transitiveDependencies.find(dep => dep.name === assm);
return assembly && assembly.types && assembly.types[ref.fqn];
type = assembly && assembly.types && assembly.types[ref.fqn];
}

if (!type) {
this._diagnostic(referencingNode, ts.DiagnosticCategory.Error, `Unable to resolve referenced type '${ref.fqn}'. Missing export?`);
}

return type;
}

private _diagnostic(node: ts.Node | null, category: ts.DiagnosticCategory, messageText: string) {
Expand Down Expand Up @@ -206,7 +213,7 @@ export class Assembler implements Emitter {
return `unknown.${typeName}`;
}
const fqn = `${pkg.name}.${typeName}`;
if (pkg.name !== this.projectInfo.name && !this._dereference({ fqn })) {
if (pkg.name !== this.projectInfo.name && !this._dereference({ fqn }, type.symbol.valueDeclaration)) {
this._diagnostic(type.symbol.valueDeclaration,
ts.DiagnosticCategory.Error,
`Use of foreign type not present in the ${pkg.name}'s assembly: ${fqn}`);
Expand Down Expand Up @@ -314,7 +321,8 @@ export class Assembler implements Emitter {
continue;
}
this._defer(() => {
if (!spec.isClassType(this._dereference(ref))) {
const deref = this._dereference(ref, base.symbol.valueDeclaration);
if (deref && !spec.isClassType(deref)) {
this._diagnostic(base.symbol.valueDeclaration,
ts.DiagnosticCategory.Error,
`Base type of ${jsiiType.fqn} is not a class (${spec.describeTypeReference(ref)})`);
Expand All @@ -340,7 +348,8 @@ export class Assembler implements Emitter {
continue;
}
this._defer(() => {
if (!spec.isInterfaceType(this._dereference(typeRef))) {
const deref = this._dereference(typeRef, expression);
if (deref && !spec.isInterfaceType(deref)) {
this._diagnostic(expression,
ts.DiagnosticCategory.Error,
`Implements clause of ${jsiiType.fqn} uses ${spec.describeTypeReference(typeRef)} as an interface`);
Expand Down Expand Up @@ -393,17 +402,15 @@ export class Assembler implements Emitter {
}
} else if (jsiiType.base) {
this._defer(() => {
const baseType = this._dereference(jsiiType.base!);
if (!baseType) {
this._diagnostic(type.symbol.valueDeclaration,
ts.DiagnosticCategory.Error,
`Unable to resolve type ${jsiiType.base!.fqn} (base type of ${jsiiType.fqn})`);
} else if (spec.isClassType(baseType)) {
jsiiType.initializer = baseType.initializer;
} else {
this._diagnostic(type.symbol.valueDeclaration,
ts.DiagnosticCategory.Error,
`Base type of ${jsiiType.fqn} (${jsiiType.base!.fqn}) is not a class`);
const baseType = this._dereference(jsiiType.base!, type.symbol.valueDeclaration);
if (baseType) {
if (spec.isClassType(baseType)) {
jsiiType.initializer = baseType.initializer;
} else {
this._diagnostic(type.symbol.valueDeclaration,
ts.DiagnosticCategory.Error,
`Base type of ${jsiiType.fqn} (${jsiiType.base!.fqn}) is not a class`);
}
}
});
} else {
Expand Down Expand Up @@ -499,17 +506,13 @@ export class Assembler implements Emitter {
continue;
}
this._defer(() => {
if (!spec.isInterfaceType(this._dereference(ref))) {
const baseType = this._dereference(ref);
if (baseType) {
this._diagnostic(base.symbol.valueDeclaration,
ts.DiagnosticCategory.Error,
`Base type of ${jsiiType.fqn} is not an interface (${baseType.kind} ${spec.describeTypeReference(ref)})`);
} else {
this._diagnostic(base.symbol.valueDeclaration,
ts.DiagnosticCategory.Error,
`Base type of ${jsiiType.fqn} could not be resolved (${spec.describeTypeReference(ref)})`);
}
const baseType = this._dereference(ref, base.symbol.valueDeclaration);
if (baseType && !spec.isInterfaceType(baseType)) {
// tslint:disable:max-line-length
this._diagnostic(base.symbol.valueDeclaration,
ts.DiagnosticCategory.Error,
`Base type of ${jsiiType.fqn} is not an interface (${baseType.kind} ${spec.describeTypeReference(ref)})`);
// tslint:enable:max-line-length
}
});
if (jsiiType.interfaces) {
Expand Down
9 changes: 9 additions & 0 deletions packages/jsii/test/negatives/neg.deref-error.ts
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Original file line number Diff line number Diff line change
@@ -0,0 +1,9 @@
///!MATCH_ERROR: Unable to resolve referenced type 'Base'. Missing export?

class Base {

}

export class Derived extends Base {

}