我对mysql全文没有太多经验。但我的简单测试正在运行。
实体：

@Entity()
export class User {

    @PrimaryGeneratedColumn()
    id: number;

    @Index({ fulltext: true })
    @Column("varchar")
    name: string;

    @Index({ fulltext: true })
    @Column("varchar")
    lastname: string;

    @Index({ fulltext: true })
    @Column("text")
    personalDescription: string;
}

使用查询生成器选择：

const searchTerm = "programmer";

const result = await connection.manager.getRepository(User)
            .createQueryBuilder()
            .select()
            .where(`MATCH(lastname) AGAINST ('${searchTerm}' IN BOOLEAN MODE)`)
            .orWhere(`MATCH(name) AGAINST ('${searchTerm}' IN BOOLEAN MODE)`)
            .orWhere(`MATCH(personalDescription) AGAINST ('${searchTerm}' IN BOOLEAN MODE)`)
            .getMany();

如果您需要更高级的全文搜索，您必须检查mysql文档。