Add comment generation to TypeScript interfaces

src/builders/ModelBuilder.ts

@@ -186,13 +186,17 @@ export class ModelBuilder extends Builder {
                 undefined,
                 undefined,
                 [
-                    ...(Object.values(columns).map(c => ts.factory.createPropertySignature(
-                        undefined,
-                        ts.factory.createIdentifier(c.name),
-                        c.autoIncrement || c.allowNull || c.defaultValue !== undefined ?
+                    ...(Object.values(columns).map(c => {
+                        const property = ts.factory.createPropertySignature(
+                          undefined,
+                          ts.factory.createIdentifier(c.name),
+                          c.autoIncrement || c.allowNull || c.defaultValue !== undefined ?
                             ts.factory.createToken(ts.SyntaxKind.QuestionToken) : undefined,
-                        ts.factory.createTypeReferenceNode(dialect.mapDbTypeToJs(c.type) ?? 'any', undefined)
-                    )))
+                          ts.factory.createTypeReferenceNode(dialect.mapDbTypeToJs(c.type) ?? 'any', undefined)
+                          ) 
+                        return c.comment ? ts.addSyntheticLeadingComment(property, ts.SyntaxKind.MultiLineCommentTrivia, `* ${c.comment}`, true) : property
+                      })
+                    )
                 ]
             );
 

src/tests/integration/mariadb/queries.ts

@@ -70,7 +70,7 @@ export const AUTHORS_TABLE_CREATES = [
     `
         CREATE TABLE ${AUTHORS_TABLE_NAME}
         (
-            author_id       INT             primary key,
+            author_id       INT             primary key COMMENT 'This column stores the PK',
             full_name       VARCHAR(80)     not null
         );
     `,

src/tests/integration/mssql/queries.ts

@@ -81,6 +81,12 @@ export const AUTHORS_TABLE_CREATES = [
             full_name       VARCHAR(80)     not null
         );
     `,
+    `EXEC sp_addextendedproperty 
+      @name = N'MS_Description', 
+      @value = 'This column stores the PK', 
+      @level0type = N'SCHEMA', @level0name = 'dbo', 
+      @level1type = N'TABLE',  @level1name = 'authors', 
+      @level2type = N'COLUMN', @level2name = 'author_id';`
 ];
 export const AUTHORS_TABLE_INSERTS = [
     `INSERT INTO ${AUTHORS_TABLE_NAME} VALUES (1, 'Isasc Asimov');`,

src/tests/integration/mysql/queries.ts

@@ -70,7 +70,7 @@ export const AUTHORS_TABLE_CREATES = [
     `
         CREATE TABLE ${AUTHORS_TABLE_NAME}
         (
-            author_id       INT             primary key,
+            author_id       INT             primary key COMMENT 'This column stores the PK',
             full_name       VARCHAR(80)     not null
         );
     `,

src/tests/integration/postgres/queries.ts

@@ -93,6 +93,7 @@ export const AUTHORS_TABLE_CREATES = [
             full_name       VARCHAR(80)     not null
         );
     `,
+    `COMMENT ON COLUMN public.authors.author_id IS 'This column stores the PK';`
 ];
 export const AUTHORS_TABLE_INSERTS = [
     `INSERT INTO ${SCHEMA_NAME}.${AUTHORS_TABLE_NAME} VALUES (1, 'Isasc Asimov');`,